正则表达式例子(Javascript版本)

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var strSrc = "xxa1b01c001yya2b02c002zz";
              var re = /a(\d)b(\d{2})c(\d{3})/gi;
              var arr,count =0;
              while( (arr=re.exec(strSrc)) != null)
             {
                  document.write(arr[0]+"<br>");
             }
         </script>
   </body>
</html>

a1b01c001
a2b02c002

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var strSrc = "xxa1b01c001yya2b02c002zz";
              var re = /a(\d)b(\d{2})c(\d{3})/gi;
              var arr,count =0;
              arr=strSrc.match(re);
             for(i=0; i<arr.length; i++)
             {
                  document.write(arr[i]+"<br>");
             }
         </script>
   </body>
</html>

a1b01c001
a2b02c002

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var strSrc = "a12b34c56";
              var re = /(\d)(\d)/gi;
              var strDest = strSrc.replace(re,"$2$1");
              document.write(strDest);
         </script>
   </body>
</html>

a21b43c65

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var strSrc = "我...我要...学..学编程!";
              var strDest = strSrc.replace(/\./g,"","").replace(/(.)\1/g,"$1");
              document.write(strDest);
         </script>
   </body>
</html>

我要学编程!

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var strSrc = "win a window";
              var strDest = strSrc.replace(/\bwin\b/g,"lose");
              document.write(strDest);
         </script>
   </body>
</html>

lose a window

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var strSrc = "first line\n"+
                           "second line\n"+
                            "third line";
              var strDest = strSrc.replace(/^/mg,"#");
              document.write(strDest);
         </script>
   </body>
</html>

#first line #second line #third line

<html>
    <head>
        <title>RegExp</title>
   </head>
   </body>
         <script language="javascript">
              var reg = /(\w+):\/\/([^/:]+)(?::(\d*))?([^#]*)/;
              var arr1 = "http://www.it315.org:8080/index.html".match(reg);
              var arr2 = "http://www.it315.org/book/welcome.html#mark1".match(reg);
              var str = "协议，主机名，端口号，资源路径\n";
              str += arr1[1] + "," + arr1[2] + "," + arr1[3] + "," + arr1[4] + "\n";
              str += RegExp.$1 + "," + RegExp.$2 + "," + RegExp.$3 + "," + RegExp.$4 + "\n";
              document.write(str);
         </script>
   </body>
</html>

协议，主机名，端口号，资源路径 http,www.it315.org,8080,/index.html http,/book/welcome.html

正则表达式例子(Javascript版本)

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