撸一个JS正则小工具

时间:2023-03-08 21:55:25

写完正则在浏览器上检测自己写得对不对实在是不方便,于是就撸了一个JS正则小demo出来。

demo

demo展示

项目地址

撸一个JS正则小工具

撸一个JS正则小工具

代码部分

首先把布局样式先写好。

 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <title>js正则查找替换工具</title>
     <link rel="stylesheet" type="text/css" href="./RegExp.css">
     <script type="text/JavaScript" src="./RegExp.js"></script>
 </head>
 <body>
     <form name="tester" action="" method="post" onSubmit="processRegex(this);return false">
         <table border="1" cellpadding="4" cellspacing="0" width="550">
             <tr>
                 <th class="Dialog">js正则查找替换工具</th>
             </tr>
             <tr>
                 <td class="Dialog">
                     <span class="header">请输入正则表达式:</span>
                     <br>
                     <input name="RegEx" type="text" size="62" style="font-size:13px">
                     <input type="checkbox" name="caseSensitive" id="caseSensitive" value="Yes">
                     <label for="caseSensitive">区分大小写</label>
                     <input type="radio" name="operation" id="operationFind" value="find" checked onClick="hideReplaceFields()">
                     <label for="OperationFind">查找</label>
                     <input type="radio" name="operation" id="operationReplace" value="replace" onClick="showReplaceFields()">
                     <label for="OperationReplace">替换</label>
                     <br>
                     <span class="header" id="replaceheader">请输入替换的正则表达式:</span>
                     <br>
                     <input id="RegExReplace" name="RegExReplace" type="text" size="62" style="font-size:13px">
                     <span class="header" style="margin-top: 3px;display: block;">填写你想查找或替换的文本:</span>
                     <textarea name="searchText"  cols="70" rows="6"></textarea>
                     <img src="http://files.cnblogs.com/files/MuYunyun/pkq.gif" style="margin-left: 10px">
                     <br>
                     <input name="submit" type="submit" style="font-weight: bold" value="开始">
                 </td>
             </tr>
         </table>
     </form><br>
     <span id="output"></span>
     <script language="JavaScript">
         hideReplaceFields();
     </script>
 </body>
 </html>

布局

 body {
     font-family: arial;
     font-size: 12px;
 }

 input {
     font-size: 11px;
 }

 textarea {
     font-size: 11px;
 }

 th {
     background:#8888FF;color:white;text-align:left
 }

 td {
     background:#CCCC99;color:black;font-size:12px
 }

 .RowA {
     background: #CCCC99
 }

 .RowB {
     background: #EEEEBB
 }

 .header {font-weight: bold}

样式

接着就是用js分别构造查找和替换两个函数,用到了RegExp对象的一些属性,思路还是比较简单的。代码如下:

 // 没选中替换则不能输入
 function hideReplaceFields() {
     document.getElementById('RegExReplace').disabled = true;
     document.getElementById('replaceheader').disabled = true;
 }

 // 点击替换则能输入
 function showReplaceFields() {
     document.getElementById('RegExReplace').disabled = false;
     document.getElementById('replaceheader').disabled = false;
 }

 // 查找
 function processRegexFind(text, regex, flags) {
     var reg = new RegExp(regex, flags);
     var lastIdx = -1;
     var iCount = 0;
     var result = "";
     var output = '<div style="height:200px;overflow-y:auto;width:550"><table border="0" cellpadding="2" cellspacing="0" width="550"><tr><th width="*">匹配内容</th><th>位置</th><th>长度</th></tr>'

     // 循环
     while (lastIdx != 0) {
         var mtch = reg.exec(text);
         if (reg.lastIndex !== 0) { //lastIndex属性存放一个整数,它声明的是上一次匹配文本之后的第一个字符的位置。
             iCount++;
             if (iCount % 2) {
                 style = "RowA"
             } else style = "RowB";
             // 输出
             output += '<tr class="' + style + '"><td>' + RegExp.lastMatch + '</td><td>' + (reg.lastIndex - RegExp.lastMatch.length) + '</td><td>' + RegExp.lastMatch.length + '</td></tr>';
         }
         lastIdx = reg.lastIndex;
     }
     output += '</table></div>';

     if (iCount !== 0) {
         result = "匹配个数: " + iCount + output;
     } else result = '未找到匹配的项';
     return result;
 }

 // 替换
 function processRegexReplace(text, regexfind, regexreplace, flags) {
     var re = new RegExp(regexfind, flags);
     var newstr = text.replace(re, regexreplace);
     var result = '<div style="height:200px;overflow-y:auto;width:550"><table border="0" cellpadding="2" cellspacing="0" width="550"><tr><th>替换后:</th></tr><tr><td>' + newstr + '</td></tr>';
     return result;
 }

 // 人口
 function processRegex(form) {
     var output = '';
     var flags;
     if (form.caseSensitive.checked) flags = "g";
     else flags = "gi";
     //判断是查找还是替换
     if (form.operationFind.checked) {
         output = processRegexFind(form.searchText.value, form.RegEx.value, flags);
     } else if (form.operationReplace.checked) {
         output = processRegexReplace(form.searchText.value, form.RegEx.value, form.RegExReplace.value, flags);
     }

     document.getElementById('output').innerHTML = output;
     return false;
 }

用这小工具学习js正则可以事半功倍哟。大家新年快乐!