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Some small exercises on regular expressions

php中世界最好的语言
Release： 2018-03-13 09:34:17
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这次给大家带来关于正则表达式的几个小练习，使用正则表达式的注意事项有哪些，下面就是实战案例，一起来看一下。

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练习1:匹配abc

 

练习2:包含一个a~z,后面必须是0~9 -->[a-z][0-9]或者[a-z]\d

    * [a-z] : a~z

    * [0-9]/\d : 0~9

 

练习3:必须第一个是字母,第二个是数字 -->^[a-z][0-9]$

    * ^[a-z] : 表示首字母必须是a~z

    * \d{2,10} : 数字有2到10

    * [a-z]$ : 表示必须以a-z的字母结尾

 

练习4:必须第一个是字母,字母后面跟上4~9个数字

 

练习5:不能是数字0-9

 

    * [^0-9] : 不能是0~9练习6:QQ匹配:^[1-9]\d{4,11}$

都是数字5~12位

并且第一位不能是0练习7:手机号码匹配^1[3578]\d{9}$1.以13/15/17/182.长度是11

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