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I see you are trying to understand how regexp works in general. There are a lot of resources on the net to test/check/try/practice, but actually I would like to suggest you a few: http://www.regexpal.com/ (you can use your mouse for explanation) http://www.regexr.com/ http://www.myregexp.com/
Indeed, thanks. I was actually looking for something like that the other day. I'm also currently reading Sed and Awk Second Edition (1997) - Dale Dougherty & Arnold Robbins, which is quite helpful.
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