php正则表达式替换URL链接地址为指定url
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。
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."; 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/"; $replacements[2] = "bear"; print preg_replace($patterns, $replacements, $str); |
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); |

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