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Re: Regexp confusion

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On Mon, 08 Jul 2013 00:26:11 +0700, JJ wrote:

> I'm trying to filter out URLs that match below conditions using regexp.

The text you've shown and the words you've used do not agree completely, 
but I've tried to resolve them as best I can.

> * Contains ".feedburner.com" or ".feedportal.com". e.g.:
>   http://feeds.feedburner.com/any http://feedportal.com/any

^.*feed(burner|portal)\.com.*$

> * Starts with "feed" and ends with ".gif".
>   http://feed.thesite.com/any/blah.gif

^(http:\/\/)?feed.*\.gif$

> * Starts with "feed" and the following characters contains ".gif?".
>   http://feedsite.com/any/blah.gif?var=blah

^(http:\/\/)?feed.*\.gif.*$

My first attempt at combining these would be:

/^(http:\/\/)?.*feed((burner|portal)\.com|.*\.gif).*$/

Tested here: http://www.sined.co.uk/tmp/regexjj.htm

There may be some potential there for false positives, which might be 
improved by checking for a word boundary before the f of feed, and after 
\.com and \.gif

However, I suspect that even so there may be potential false positives, 
for example any gif image on feedtheworld.com.

-- 
Denis McMahon, denismfmcmahon@gmail.com

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Regexp confusion JJ <duh@nah.meh> - 2013-07-08 00:26 +0700
  Re: Regexp confusion dann90038@gmail.com - 2013-07-07 12:21 -0700
    Re: Regexp confusion Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-07-07 22:18 +0200
  Re: Regexp confusion Denis McMahon <denismfmcmahon@gmail.com> - 2013-07-07 20:28 +0000
  Re: Regexp confusion JJ <duh@nah.meh> - 2013-07-08 08:24 +0700
    Re: Regexp confusion Andreas Bergmaier <andber93@web.de> - 2013-07-08 17:51 +0200
      Re: Regexp confusion JJ <duh@nah.meh> - 2013-07-09 03:58 +0700

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