JavaScript Regular Expression Summary (test|match|search|replace|split|exec) __ Regular Expressions

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

Test : Tests whether 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
</script>

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
</script>

Replace: A regular match based on pattern, and the matching result is replaced by 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!
</script>

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 "," "] 
</script>

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!"]