Please note, this is a STATIC archive of website developer.mozilla.org from November 2016, cach3.com does not collect or store any user information, there is no "phishing" involved.

sleep

成为会员
sleep

近期活跃的文档

查看所有活动
页面 日期 评论

正则表达式


x(?=y) 应该是"正向肯定查找";x(?!y)应该是 "正向否定查找"