How to replace specified characters in php regular variables

高洛峰
Release: 2023-03-05 06:42:01
Original
2114 people have browsed it

本文实例讲述了php正则替换变量指定字符的方法。分享给大家供大家参考。具体如下:

这里介绍三种常用方法.

方法一:

$1",$txt); ?>
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方法二:

$1",$txt); ?>
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方法三:

$1",$txt); ?>
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三种方法都返回同样结果.. PHP中的Perl风格正则与Perl完全一样.连quotemeta也是通用的..

一些其它关于正则的实例

例子:

$text = "foobar123fooabcbar"; $text = preg_replace("/foo(?=bar)/", "***", $text); //匹配bar前面的位置 ***bar123fooabcbar
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$text = "foobar123fooabcbar"; $text = preg_replace("/(?<=bar)123/", "***", $text); //匹配bar后面的位置 foo***123fooabcbar
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$text = "foobar123fooabcbar"; $text = preg_replace("/foo(?!bar)/", "***", $text); //匹配后面跟的不是bar的位置 foobar123***abcbar
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$text = "foobar123fooabcbar"; $text = preg_replace("/(?
        
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希望本文所述对大家的php程序设计有所帮助。

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