PHP常见正则

1.字符串中图片 /<img((?!src).)*src[\s]*=[\s]*[\'"](?<src>[^\'"]*)[\'"]/i return 数组

2.匹配字符串标签内容     $search = '/<h2>(.*?)<\/h2>/si';

                                        preg_match_all($search ,$call, $errO);