JavaScript Regular Expression Summary (test|match|search|replace|split|exec) _javascript tips

Learn JavaScript regular Good Article one: http://www.cainiao8.com/web/js_note/js_regular_expression.html

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

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

Match : A regular match based on pattern and, if matched to, returns a matching result, such as a match that does not return a null

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

Search : A regular match based on pattern, or the number of indexes if it matches to a result, or return 1

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

Replace: a regular match based on pattern, replacing the result with a replacement

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

Split : Regular segmentation based on pattern, return of a segmented array

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

exec : Regular processing of string and return of matching results. Array[0] is the original string, Array[i] to match the position in the entire searched string.

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

The above is a small series to introduce the JavaScript regular expression summary (test|match|search|replace|split|exec), I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!