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php正则表达式替换URL链接地址为指定url

Jun 08, 2016 pm 05:24 PM
bootstrap gt quot replace

本文章先是讲述了简单的利用php正则表达试来替换字符中的一些字符,然后再再告诉你正则表达式替换URL链接地址为指定url地址方法有需要学习的朋友可参考。

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PHP正则表达式替换的相关概念:

preg_replace:执行正则表达式的搜索和替换

mixed preg_replace (   mixed pattern,   mixed replacement,   mixed subject [, int limit]) preg_replace:允许你替换字符串中匹配到你定义的正则表达式。一个简单的注释移除功能:

preg_replace('[(/*)+.+(*/)]', '', $val); 这段代码可以移除在 PHP 和 CSS 中使用 /* 注释 */ 格式的多多行注释。其中的三个参数分别为正则表达式,要替换成的字符串和要替换的目标字符串(这里要做移除功能,所以是个空白字符串 -> '')。如果你想匹配次级规则,可以使用 $0 代表全部匹配,$1、$2 等,以此类推代表分别的次级规则。

如把空格替换-

例子 1 :

 代码如下 复制代码

$str = "The quick brown fox jumped over the lazy dog.";
$str = preg_replace('/s/','-',$str);
echo $str;
?>
输出结果为:

The-quick-brown-fox-jumped-over-the-lazy-dog.

替换数组

 代码如下 复制代码

$str = "The quick brown fox jumped over the lazy dog.";

$patterns[0] = "/quick/";
$patterns[1] = "/brown/";
$patterns[2] = "/fox/";

$replacements[2] = "bear";
$replacements[1] = "black";
$replacements[0] = "slow";

print preg_replace($patterns, $replacements, $str);
/*输出:
The bear black slow jumped over the lazy dog.
*/
ksort($replacements);
print preg_replace($patterns, $replacements, $str);
/*输出:
The slow black bear jumped over the lazy dog.
*/
?>


链接形式是:Bootstrap中文网

而我们采集后希望变成:Bootstrap中文网

这里面涉及到正则出来url链接的关键字问题。示例代码如下:

 代码如下 复制代码

$a = 'Bootstrap中文网提供Bootstrap中文手册,学习Bootstrap入门教程Bootstrap是Twitter推出的一个用于前端开发的开源工具包。它由Twitter的设计师Mark Otto和Jacob Thornton合作开发,是一个CSS/HTML框架。Bootstrap中文网致力于为广大国内开发者提供详尽的中文文档、代码实例等,助力开发者掌握并使用这一框架。';

$lines_string=preg_replace("(]*>(.+?))","$1",$a);
print_r($lines_string);
?>

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