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Re: How to match regex in bash? (any character)

From: Peng Yu
Subject: Re: How to match regex in bash? (any character)
Date: Tue, 27 Sep 2011 19:58:50 -0500

On Tue, Sep 27, 2011 at 6:51 PM, Chet Ramey <address@hidden> wrote:
> On 9/27/11 6:41 PM, Roger wrote:
>> Correct.  After reading the entire Bash Manual page, I didn't see much 
>> mention
>> of documentation resources (of ERE) besides maybe something about egrep from
>> Bash's Manual Page or elsewhere on the web.  After extensive research for
>> regex/regexpr, only found Perl Manual Pages.
>> Might be worth mentioning a link or good reference for this ERE within the 
>> Bash
>> Manual (Page)?
> The bash man page refers to regex(3).  On my BSD (Mac OS X) system, that
> refers to re_format(7), which documents the BRE and ERE regular expression
> formats.  On an Ubuntu box, to choose a representative Linux example, that
> refers to regex(7), which contains the same explanation, and the GNU regex
> manual.  This sort of "chained" man page reference is common.
> If you like info, `info regex' on a Linux box should display both pages.

Since regex(7) is actually what should be referred on ubuntu, and
there is indeed a manpage regex(3) on ubuntu, the difference on which
regex man page should be specify in man bash. I was looking at
regex(3) on my ubuntu, which doesn't have any relevant information.

Also, adding a few more examples just cost a few extra lines, I don't
think that the manpage should be so frugal in terms of adding examples
to elucidate important concepts.


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