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php正则替换中变量的指定字符

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Release: 2016-06-13 09:47:40
Original
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下面举了三个实现来介绍在php正则替换中变量的指定字符,有需要学习的机友可参考参考。

三种方法.

1.

 代码如下 复制代码

$str = preg_quote('(银子)');
$txt = '我的呢称(银子)';
echo preg_replace("/($str)/","$1",$txt);
?>

2.

 代码如下 复制代码

$str = quotemeta('(银子)');
$txt = '我的呢称(银子)';
echo preg_replace("/($str)/","$1",$txt);
?>

3.

 代码如下 复制代码
$str = '(银子)';
$txt = '我的呢称(银子)';
echo preg_replace("/(Q$strE)/","$1",$txt);
?>

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:

 代码如下 复制代码

$text  = “foobar123fooabcbar”;

$text = preg_replace(“/foo(?=bar)/”, “***”, $text);

//匹配bar前面的位置 ***bar123fooabcbar

 

 代码如下 复制代码

$text  = “foobar123fooabcbar”;

$text = preg_replace(“/(?

//匹配bar后面的位置  foo***123fooabcbar

 

 代码如下 复制代码

$text  = “foobar123fooabcbar”;

$text = preg_replace(“/foo(?!bar)/”, “***”, $text);

//匹配后面跟的不是bar的位置       foobar123***abcbar

 

 代码如下 复制代码

$text  = “foobar123fooabcbar”;

$text = preg_replace(“/(?

//匹配前面不是foo的位置 foobar123fooabc***

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