Thread: Novice Regex Question

really dumb regex question, how invoke command terminal use following regex command? presume combination of cat on file urls , grep?

here's regex command (from http://daringfireball.net/2010/07/im...atching_urls):

code:

(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))

grep 'pattern' filename

or equivalent

grep 'pattern' < filename

if want grep fixed string, use

echo 'string' | grep 'pattern'

complex patterns, important encase them in single quotes bash shell won't try , interpret pattern. if you're searching single word, can omit quotes.

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