Re: How to match pattern in bash?

[Greg Wooledge]

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).