invalid regexp group

Question

I have regular expression

(?<=\\s)(?:#sidebar-right-1|#BlogArchive1|#ArchiveList|#BlogArchive1_ArchiveList|#PopularPosts)(?=\\s|{)

I got syntax error invalid regex group. Where is problem?

I applied it like this:

rules[r].selectorText.match(new RegExp(ids, 'gm'))

Answer 1

看来javascript的正则表达式不支持肯定的后向断言（即(?<=\\s)部分）。