1.1.零宽断言

I’m singing while you are dancing.

dancing ,sing a song.ing.singed a song.danced a long.

time.danceabsd.cn

 

匹配上面字符串中ing前面的字符。

答案:\b\w+(?=ing\b)

posted @ 2017-12-12 23:16  雅虎跳跳  阅读(143)  评论(0)    收藏  举报