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

学javascript正则的好文一篇：http://www.cainiao8.com/web/js_note/js_regular_expression.html

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> 

1楼gshengod昨天 17:17

可以加上trim这些