Home Web Front-end JS Tutorial How to use the {n,m} quantifier of regular expressions

How to use the {n,m} quantifier of regular expressions

Mar 30, 2018 pm 01:54 PM
use how expression

这次给大家带来正则表达式的{n,m}量词如何使用,正则表达式{n,m}量词使用的注意事项有哪些,下面就是实战案例,一起来看一下。

正则表达式{n,m}量词:

{n,m}量词可以重复前面匹配的字符n-m次,至少n次,最多m次。

语法结构:
构造函数方式:

new RegExp("x{n,m}")
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对象直接量方式:

/x{n,m}/
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浏览器支持:
IE浏览器支持此元字符。
火狐浏览器支持此元字符。
谷歌浏览器支持此元字符。

实例代码:

实例一:

var str="100,1000 or 10000"; 
var reg=new RegExp("\\d{3,4}","g");
console.log(str.match(reg));
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以上代码可以匹配3位或者4位数字。

实例二:

var str="100,1000 or 10000"; 
var reg=/\d{3,4}/g;
console.log(str.match(reg));
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此代码的作用和上面的代码是一样的。只是正则的不同定义方式。

建议大家在学习的时候,通过这个JavaScript正则表达式在线测试工具方便查看效果。

看上面的效果三个数字只匹配1000,只匹配3-4个数字,少了多了都不行

相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!

推荐阅读:

正则的模式修饰符使用详解

正则表达式u修饰符的使用详解(附代码)

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