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浅析PHP正则表达式定位字符

Jun 13, 2016 am 11:03 AM
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对于PHP正则表达式定位字符的使用是我们在开发过程中经常会遇到的,那么具体的PHP正则表达式定位字符种类有什么呢?他们具体的代表什么内容呢?让我们开始逐一介绍。

PHP正则表达式定位字符的作用:

PHP正则表达式定位字符是PHP正则表达式中一类非常重要的字符,它的主要作用是用于对字符在匹配对象中的位置进行描述。

PHP正则表达式定位字符的种类及含义:

◆^:

表示匹配的模式出现在匹配对象的开头(和在"[]"里面不同)

◆$:

表示匹配的模式出现在匹配对象的末尾

◆空格:

表示匹配的模式出现在开始和结尾的两个边界之一

◆"/^he/":

可以匹配以"he"字符开头的字符串,比如hello、height等等;

◆"/he$/":

可以匹配以"he"字符结尾的字符串即she等;

◆"/ he/":

空格开头,和^的作用一样,匹配以he开头的字符串;

◆"/he /":

空格结束,和$的作用一样,匹配以he结尾的字符串;

◆"/^he$/":

表示只和字符串"he"匹配。

PHP正则表达式定位字符的简单介绍就向你讲述到这里,希望对你了解和掌握PHP正则表达式定位字符有所帮助。


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