gnu grep is -Perfect
I wanted to use grep recently and needed to grab a couple of lines using a regular expression that I knew would work in perl, but I couldn't make work in egrep functionality.
A little trolling through the man page pointed me to the -P option which provides perl like regular expression capabilities.
All of a sudden you have access to things like \d{3,6} and other perl regex niceities.
No more cat
grep -P is perfect
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