程序代码

function match_links($document) {
    preg_match_all("'<s*as.*?hrefs*=s*(["'])?(?(1)(.*?)1|([^s>]+))[^>]*>?(.*?)</a>'isx",$document,$links);
    while(list($key,$val) = each($links[2])) {
        if(!emptyempty($val))
            $match['link'][] = $val;
    }
    while(list($key,$val) = each($links[3])) {
        if(!emptyempty($val))
            $match['link'][] = $val;
    }
    while(list($key,$val) = each($links[4])) {
        if(!emptyempty($val))
            $match['content'][] = $val;
    }
    while(list($key,$val) = each($links[0])) {
        if(!emptyempty($val))
            $match['all'][] = $val;
    }
    return $match;
}
<?php
echo preg_replace("/(?<=href=)([^>]*)(?=>)/i","#", "<a href='www.phpfensi.com'>你好，点这里看看</a><a href='www.phpfensi.com'>你好，点这里看看</a>");
?>