Javascript-Common regular function (for forgetting to see)

Test : Tests whether a string contains a matching result, contains a return of true, and does not contain a return of false.

<script type= "Text/javascript" >      var str = "bbs.byr.cn";       var reg =/b/;       var ret = reg.test (str);       // true   </script>  

match: Regular match based on pattern, if matched to, returns match result, such as no match to return null

<script type= "Text/javascript" >      var str = "This isn ' t me";        var reg =/is/ig;       var ret = str.match (reg);       // is, is      // [' Is ', ' is ']    </script>   

Search : a regular match based on pattern, and returns the number of indexes if it matches a result; 1

<script type= "Text/javascript" >      var str = "This isn ' t me";       var reg =/is/;       var ret = str.search (reg);      alert (ret); // 2   </script>  

Replace: Regular match according to pattern, replace the match result with replacement, the second parameter can be changed to function.

 <script type= "Text/javascript" > var  str = "I love china!"       var  pattern =/i/G;       var  ret = str.replace (pattern, "I" ); alert (ret);   // i Love china!  </script> 

<script type= "Text/javascript" >    var argv = ["1", "2"];     var str = "%s,%s";     var i = 0;     function () {        return argv[i++];    }); </script>

Split: Regular segmentation According to pattern, returns a segmented array

<script type= "Text/javascript" >      var  str = ' http://www.baidu.com/';       var  reg =/\w/;       var  ret = str.split (reg);       // ["http", "", "", "www", "Baidu", "com", "" "   ) </script>  

exec: string is processed in regular order, and the matching result is returned. Array[0] is the original string, Array[i] is the position of the match within the entire searched string. you can use the while (arr = re.exec (str)) = null) to find all .

<script type= "Text/javascript" >      var str = "I love china!" ;        var reg =/i\b/g;        var ret = reg.exec (str);        // I      // ["I", index:9, Input: "I love china!"]    </script>  

Javascript-Common regular function (for forgetting to see)