日常收集整理php正则表达式(超常用)(4)

/** * replace some string by callback function * */ function callback_replace() { $url = 'http://esfang.house.sina.com.cn'; $str = ''; $str = preg_replace ( '/(?<=saction=")(?!http:)(.*?)(?="s)/e', 'search($url, \1)', $str ); echo $str; } function search($url, $match){ return $url . 'https://www.jb51.net/' . $match; }

带断言的正则匹配

$match = ''; $str = 'xxxxxx.com.cn bold font paragraph text '; preg_match_all ( '/(?<=<(w{1})>).*(?=</1>)/', $str, $match );

echo "匹配没有属性的HTML标签中的内容：";

print_r ( $match );

替换HTML源码中的地址

以下为引用的内容：

$form_html = preg_replace ( '/(?<=saction="|ssrc="|shref=")(?!http:|javascript)(.*?)(?="s)/e', 'add_url($url, '\1')', $form_html );
元字符