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From: grarpamp <grarpamp@gmail.com>
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Subject: Re: regex lint
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> No, grep(1) uses the GNU regex library, while find(1) uses the
> one from libc (which, among other shortcomings, is not localized).

Ok.

> /(foo|)/ is equivalent to /(foo)?/

I should've seen that grouping simplification. I was thinking this
was all that was left to use: 'foo\.bar$|foo$'
Thx.