知道这20个正则表达式，能让你少写1,000行代码

admin 发表于 2016-10-19 17:47:03

<p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">正则表达式，一个十分古老而又强大的文本处理工具，仅仅用一段非常简短的表达式语句，便能够快速实现一个非常复杂的业务逻辑。熟练地掌握正则表达式的话，能够使你的开发效率得到极大的提升。<p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">正则表达式经常被用于字段或任意字符串的校验，如下面这段校验基本日期格式的JavaScript代码：<pre class="hljs scala" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="scala" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">var reg = /^(\\d{1,4})(-|\\/)(\\d{1,2})\\2(\\d{1,2})$/;
var r = fieldValue.match(reg);
if(r==null)alert('Date format error!');</code></pre><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">下面是技匠整理的，在前端开发中经常使用到的20个正则表达式。<hr style="margin-bottom: 20px; border-right-width: 0px; border-left-width: 0px; border-top-style: solid; border-top-color: rgb(217, 217, 217); border-bottom-style: solid; border-bottom-color: white; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">1 . 校验密码强度</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">密码的强度必须是包含大小写字母和数字的组合，不能使用特殊字符，长度在8-10之间。<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^(?=.*\\d)(?=.*)(?=.*).{8,10}$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">2. 校验中文</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">字符串仅能是中文。<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^[\\u4e00-\\u9fa5]{0,}$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">3. 由数字、26个英文字母或下划线组成的字符串</h4><pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^\\w+$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">4. 校验E-Mail 地址</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">同密码一样，下面是E-mail地址合规性的正则检查语句。<pre class="hljs markdown" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="markdown" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">[\\w!#$%&'*+/=?^_`{|}~-]+(?:\\.[\\w!#$%&'*+/=?^_`{|}~-]+)*@(?:[\\w](?:[\\w-]*[\\w])?\\.)+[\\w](?:[\\w-]*[\\w])?</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">5. 校验身份证号码</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">下面是身份证号码的正则校验。15 或 18位。<p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">15位：<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^[1-9]\\d{7}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}$</code></pre><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">18位：<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^[1-9]\\d{5}[1-9]\\d{3}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}([0-9]|X)$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">6. 校验日期</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">“yyyy-mm-dd“ 格式的日期校验，已考虑平闰年。<pre class="hljs markdown" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="markdown" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^(?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29)$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">7. 校验金额</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">金额校验，精确到2位小数。<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^[0-9]+(.[0-9]{2})?$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">8. 校验手机号</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">下面是国内 13、15、18开头的手机号正则表达式。（可根据目前国内收集号扩展前两位开头号码）<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\\d{8}$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">9. 判断IE的版本</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">IE目前还没被完全取代，很多页面还是需要做版本兼容，下面是IE版本检查的表达式。<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^.*MSIE [5-8](?:\\.[0-9]+)?(?!.*Trident\\/[5-9]\\.0).*$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">10. 校验IP-v4地址</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">IP4 正则语句。<pre class="hljs markdown" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="markdown" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">11. 校验IP-v6地址</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">IP6 正则语句。<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">12. 检查URL的前缀</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">应用开发中很多时候需要区分请求是HTTPS还是HTTP，通过下面的表达式可以取出一个url的前缀然后再逻辑判断。<pre class="hljs scala" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="scala" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">if (!s.match(/^+:\\/\\//))
{
s = 'http://' + s;
}</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">13. 提取URL链接</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">下面的这个表达式可以筛选出一段文本中的URL。<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^(f|ht){1}(tp|tps):\\/\\/([\\w-]+\\.)+[\\w-]+(\\/[\\w- ./?%&=]*)?</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">14. 文件路径及扩展名校验</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">验证windows下文件路径和扩展名（下面的例子中为.txt文件）<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^([a-zA-Z]\\:|\\\\)\\\\([^\\\\]+\\\\)*[^\\/:*?"<>|]+\\.txt(l)?$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">15. 提取Color Hex Codes</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">有时需要抽取网页中的颜色代码，可以使用下面的表达式。<pre class="hljs cpp" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="cpp" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^#({6}|{3})$</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">16. 提取网页图片</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">假若你想提取网页中所有图片信息，可以利用下面的表达式。<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">\\< *[img][^\\\\>]*[src] *= *[\\"\\']{0,1}([^\\"\\'\\ >]*)</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">17. 提取页面超链接</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">提取html中的超链接。<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">(<a\\s*(?!.*\\brel=)[^>]*)(href="https?:\\/\\/)((?!(?:(?:www\\.)?'.implode('|(?:www\\.)?', $follow_list).'))[^"]+)"((?!.*\\brel=)[^>]*)(?:[^>]*)></code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">18. 查找CSS属性</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">通过下面的表达式，可以搜索到相匹配的CSS属性。<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;">^\\s*[a-zA-Z\\-]+\\s*[:]{1}\\s[a-zA-Z0-9\\s.#]+[;]{1}</code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">19. 抽取注释</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">如果你需要移除HMTL中的注释，可以使用如下的表达式。<pre class="hljs xml" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="xml" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;"></code></pre><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">20. 匹配HTML标签</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">通过下面的表达式可以匹配出HTML中的标签属性。<pre class="hljs tex" style="padding: 9.5px; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(101, 123, 131); border-radius: 4px; margin-bottom: 20px; line-height: 20px; word-break: break-all; word-wrap: normal; border: 1px solid rgba(0, 0, 0, 0.14902); overflow: auto; background: rgb(253, 246, 227);"><code class="tex" style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 12px; border-radius: 3px; border: none; background-color: transparent;"><\\/?\\w+((\\s+\\w+(\\s*=\\s*(?:".*?"|'.*?'|[\\^'">\\s]+))?)+\\s*|\\s*)\\/?></code></pre><hr style="margin-bottom: 20px; border-right-width: 0px; border-left-width: 0px; border-top-style: solid; border-top-color: rgb(217, 217, 217); border-bottom-style: solid; border-bottom-color: white; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">正则表达式的相关语法</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">下面是我找到的一张非常不错的正则表达式 Cheat Sheet，可以用来快速查找相关语法。<div class="image-package imagebubble" widget="ImageBubble" style="margin-right: auto; margin-bottom: 20px; margin-left: auto; text-align: center; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://upload-images.jianshu.io/upload_images/1399853-1b08244a4d375624.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" data-original-src="http://upload-images.jianshu.io/upload_images/1399853-1b08244a4d375624.jpg?imageMogr2/auto-orient/strip%7CimageView2/2" class="imagebubble-image" style="max-width: 100%; height: auto; vertical-align: middle; border: 0px; cursor: -webkit-zoom-in; transition: all 0.25s ease-in-out;"> </div><hr style="margin-bottom: 20px; border-right-width: 0px; border-left-width: 0px; border-top-style: solid; border-top-color: rgb(217, 217, 217); border-bottom-style: solid; border-bottom-color: white; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">学习正则表达式</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">我在网上看到了一篇相当不错的正则表达式<a href="https://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx" target="_blank" style="color: rgb(64, 148, 199); text-decoration: none;">快速学习指南</a>，有兴趣继续深入学习的同学可以参考。<div class="image-package imagebubble" widget="ImageBubble" style="margin-right: auto; margin-bottom: 20px; margin-left: auto; text-align: center; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://upload-images.jianshu.io/upload_images/1399853-017f7201958ae676.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" data-original-src="http://upload-images.jianshu.io/upload_images/1399853-017f7201958ae676.png?imageMogr2/auto-orient/strip%7CimageView2/2" class="imagebubble-image" style="max-width: 100%; height: auto; vertical-align: middle; border: 0px; cursor: -webkit-zoom-in; transition: all 0.25s ease-in-out;"> </div><hr style="margin-bottom: 20px; border-right-width: 0px; border-left-width: 0px; border-top-style: solid; border-top-color: rgb(217, 217, 217); border-bottom-style: solid; border-bottom-color: white; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><h4 style="font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; line-height: 1.8; color: rgb(47, 47, 47); text-rendering: optimizeLegibility; font-size: 20px;">正则表达式在线测试工具</h4><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><a href="https://regex101.com/#javascript" target="_blank" style="color: rgb(64, 148, 199); text-decoration: none;">regex101</a>是一个非常不错的正则表达式在线测试工具，你可以直接在线测试你的正则表达式哦。 <div class="image-package imagebubble" widget="ImageBubble" style="margin-right: auto; margin-bottom: 20px; margin-left: auto; text-align: center; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://upload-images.jianshu.io/upload_images/1399853-2c13bde71d91694c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" data-original-src="http://upload-images.jianshu.io/upload_images/1399853-2c13bde71d91694c.png?imageMogr2/auto-orient/strip%7CimageView2/2" class="imagebubble-image" style="max-width: 100%; height: auto; vertical-align: middle; border: 0px; cursor: -webkit-zoom-in; transition: all 0.25s ease-in-out;"> </div><hr style="margin-bottom: 20px; border-right-width: 0px; border-left-width: 0px; border-top-style: solid; border-top-color: rgb(217, 217, 217); border-bottom-style: solid; border-bottom-color: white; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;"><p style="margin-bottom: 25px; text-align: justify; word-break: break-word; color: rgb(47, 47, 47); font-family: -apple-system, 'Helvetica Neue', Arial, 'PingFang SC', 'lucida grande', 'lucida sans unicode', lucida, helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif; font-size: 16px; line-height: 27.2px;">另外，我也网上找到几本不错的正则表达式方面的教程和书籍，并将它们分享到了<a href="http://www.jianshu.com/p/e7bb97218946/comments/jijiangshe.com" target="_blank" style="color: rgb(64, 148, 199); text-decoration: none;">技匠社jijiangshe.com</a>，如果你有兴趣学习欢迎访问获取。^_^

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捡代码论坛-最全的游戏源码下载技术网站！'s Archiver

知道这20个正则表达式，能让你少写1,000行代码