$content = '<br><a target="_blank" href="/redirect/http%3A//www.ctdisk.com/u/1227383">http://www.ctdisk.com/u/1227383</a>
</td>';
$content = preg_replace('/<a\s+.*?>(.*?)<\/a>/i', '${1}', $content);
去除所有链接
替换所有 class="innerlink" 的 a 标签:
$content = preg_replace('/<A\s+class=innerlink.*?>(.*?)<\/A>/i', '${1}', $content);
严格一点,替换 class="innerlink" 且 title=链接文字 的标签:
$content = preg_replace('/<A\s+class="?innerlink"?.*?\stitle="?(.*?)"?.*?>\s*(\1)\s*<\/A>/i', '${1}', $content);