[RndTbl] Grep supports Perl regexp! Who knew?

[Trevor Cordes]

On 2013-01-09 Adam Thompson wrote:
> Command Line Magic (@climagic) tweeted at 11:58 AM on Wed, Jan 09,
> 2013: grep -o -P "(?<=CRON\[)\d+" /var/log/syslog # GNU grep supports
> perl regex expressions. This gives only the PID on CRON lines in

Yup, been using it for years (of course).  The POSIX syntax for stuff
like \a \w and \b are clumsy, ugly and hard to type.  Perl does it
sooooo much better.  And you even can use negative look-behinds and
other fun stuff!  Perl's da bomb!