Comments on: Regular Expressions http://www.shiffman.net Fri, 05 Dec 2008 14:21:31 +0000 http://wordpress.org/?v=2.6 By: Christin http://www.shiffman.net/teaching/a2z/regex/#comment-11062 Christin Wed, 31 Jan 2007 20:46:45 +0000 http://www.shiffman.net/teaching/programming-from-a-to-z/regex/#comment-11062 Is there a way to run egrep from the command line that will return only the matched pattern and not the entire line of text that that pattern was found in? Christin Is there a way to run egrep from the command line that will return only the matched pattern and not the entire line of text that that pattern was found in?

Christin

]]> By: Dale http://www.shiffman.net/teaching/a2z/regex/#comment-118 Dale Wed, 01 Mar 2006 14:10:24 +0000 http://www.shiffman.net/teaching/programming-from-a-to-z/regex/#comment-118 In your example, \b([0-9A-Za-z]+)\s+\1\b, you say "The third part \1 says match whatever you matched that was enclosed inside the first set of parentheses." However, where does this description come from? I'm just learning regex and I thought the backslash meant to treat the following character as a literal character. Thanks! Dale In your example, \b([0-9A-Za-z]+)\s+\1\b, you say “The third part \1 says match whatever you matched that was enclosed inside the first set of parentheses.” However, where does this description come from? I’m just learning regex and I thought the backslash meant to treat the following character as a literal character.

Thanks!
Dale

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