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Re: How to match pattern in bash?

From: Greg Wooledge
Subject: Re: How to match pattern in bash?
Date: Wed, 23 Feb 2011 08:25:47 -0500
User-agent: Mutt/

On Tue, Feb 22, 2011 at 08:03:39PM -0800, Micah Cowan wrote:
> Bash's special builtin [[ ]] syntax also provides both wildcards, and
> (much more powerful) extended regexes (roughly similar to Perl regexes;
> they're what egrep uses).

Just for the record, ERE (Extended Regular Expressions), as used by egrep
and by bash's [[ =~ operator, are not the same as PCRE (Perl-Compatible
Regular Expressions).

Neither bash, nor any POSIX-defined tool, provides PCRE.  Some GNU tools
that have extensions to the POSIX standard might offer them (the only
one I know off hand is GNU grep's -P flag).

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