PHP 字符串截取()[]{} 中内容

$str="你好<我>(爱)[北京]{天安门}";echo f1($str); //返回你好 echo f2($str); //返回我 echo f3($str); //返回爱 echo f4($str); //返回北京 echo f5($str); //返回天安门function f1($str) { $result = array(); preg_match_all("/^(.*)(?:<)/i",$str, $result); return $result[1][0]; } ?function f2($str) { $result = array(); preg_match_all("/(?:<)(.*)(?:>)/i",$str, $result); return $result[1][0]; }function f3($str) { $result = array(); preg_match_all("/(?:\()(.*)(?:\))/i",$str, $result); return $result[1][0]; }function f4($str) { $result = array(); preg_match_all("/(?:\[)(.*)(?:\])/i",$str, $result); return $result[1][0]; }function f5($str) { $result = array(); preg_match_all("/(?:\{)(.*)(?:\})/i",$str, $result); return $result[1][0]; }链接：https://www.jianshu.com/p/1926b0e7dc65