JavaScript中6个正则匹配总结（test/match/search/replace/split/exec）

【摘要】在JavaScript中，我们使用正则表达式进行字符串匹配的情况是非常多的，简单总结了一下JavaScript中所有与正则表达式相关的方法。

test()：检测字符串中是否包含匹配的字符串，返回值：true/false

1. <script type="text/javascript">  

2.     var str = "www.mafutian.net";  

3.     var reg = /mafutian/;  

4.     var ret = reg.test(str);  

5.     console.log(ret);	//	true

6. </script>

match()：根据匹配规则进行正则匹配,如果匹配成功,返回匹配结果,如匹配不到返回null

1. <script type="text/javascript">  

2.     var str = "My name is Mike";   

3.     var reg = /m/ig;  

4.     var ret = str.match(reg); 

5.     console.log(ret); //["M","m", "M"]   

6. </script>

search()：根据pattern进行正则匹配,如匹配到一个结果,则返回它的索引数,否则返回-1

1. <script type="text/javascript">  

2.     var str = "My name is Mike";  

3.     var reg = /m/;  

4.     var ret = str.search(reg);  

5.     console.log(ret); // 5

6. </script>

replace()：根据pattern进行正则匹配,把匹配结果替换为replacement

1. <script type="text/javascript">  

2.     var str = "My name is Mike";  

3.     var pattern = /m/g;  

4.     var ret = str.replace(pattern, "I");  

5.     console.log(ret); //	My naIe is Mike

6. </script> 

split()：根据pattern进行正则分割,返回一个分割的数组

1. <script type="text/javascript">  

2.     var  str = 'http://www.mafutian.net/';  

3.     var  reg = /\W/;

4.     var  ret = str.split(reg);

5.     console.log(ret); //	["http", "", "", "www", "mafutian", "net", ""]

6. </script>

exec()：对string进行正则处理,并返回匹配结果.array[0]为原字符串,array[i]为匹配在整个被搜索字符串中的位置

1. <script type="text/javascript">  

2.     var str = "My name is Mike";   

3.     var reg = /i\B/g;   

4.     var ret = reg.exec(str); 

5.     console.log(ret); //	["i", index: 8, input: "My name is Mike"]

6. </script>

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