js Abba逆向前瞻正则匹配实例

<script>
var s1 = 'acritan';
var s2 = 'bassarisk';
var s3 = 'motive';

//找出不包含 "abba" 模式的单词

var r = /^(?!.?(.)(.)\2\1)/i;

alert(r.test(s1)); // true
alert(r.test(s2)); // false
alert(r.test(s3)); // false
</script>

$str="abcgwcab";
$parent='/bc(?!ww)gw/';
$str=preg_match($parent,$str,$match);
var_dump($str);
var_dump($match);
/
输出
int 1
array (size=1)
 0 => string 'bcgw' (length=4)
/