Hi,everyone.

I have a problem when using the grep.
for example:
a <- c("aa","aba","abac")
b<- c("ab","aba")

I want to match the whole word,so
grep("^aba$",a)
it returns 2

but when I used it a more useful way:
grep("^b[2]$",a),
it doesn't work at all, it can't find it, returning integer(0).

How can I chang the format in the second way?

Thanks.

-- 
Shao

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