ereg_replace — 正则表达式替换(php 3,php 4,php 5)
string ereg_replace(string pattern,string replacement,string string)
本函数在 string 中扫描与 pattern 匹配的部分,并将其替换为 replacement,返回替换后的字符串,(如果没有可供替换的匹配项则会返回原字符串):
- <?php
- $string = "this is a test";
- echo str_replace(" is", " was", $string);
- echo ereg_replace("( )is", "1was", $string);
- echo ereg_replace("(( )is)", "2was", $string);
- ?>
- //输出如下:
- //that was a test
- //that was a test
- //that was a test
<td class='title'>热卖oou限量版双人浴巾</td>
整个替换为空,还是将
<td class='title'>热卖oou限量版双人浴巾</td>
替换成
<td class='title'></td>
第一种:echo preg_replace('/(<td[^<>]+title[^<>]+>)[^<>]*(</td>)/i', '', $html);
第二种:echo preg_replace('/(<td[^<>]+title[^<>]+>)[^<>]*(</td>)/i', '$1$2', $html);
首先这个正则表达式匹配 类似格式:
<td*title*>*</td>,这里每个星号*代表的是多个任意字符,相当于每个*对应正则里的[^<>]+,为了匹配准确,这里任意字符里不包含'<','>'.
对于第二种里的替换字符串$1和$2,分别为正则表达式里对应的两组()内匹配的值.这种形式正则里叫 子模式匹配.$1和$2叫反向匹配的结果.
这里$1匹配的结果是<td class='title'>,$2匹配的结果是</td>.
波比源码 » php 正则 ereg_replace替换
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