正则表达式例子(Javascript版本)

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<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, www.it315.org, , /book/welcome.html

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