javascript正则表达式总结(test|match|search|replace|split|exec)

Posted 2020-10-01

test：测试string是否包含有匹配结果，包含返回true，不包含返回false。

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

match：根据pattern进行正则匹配,如果匹配到,返回匹配结果,如匹配不到返回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"]   
</script>  

 

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

<script type="text/javascript">  
    var str = "This isn‘t me";  
    var reg = /is/;  
    var ret = str.search(reg);  
    alert(ret);//2  
</script> 

 

replace：根据pattern进行正则匹配,把匹配结果替换为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：根据pattern进行正则分割,返回一个分割的数组

<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：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。

<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!"]   
</script>