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Message-ID: <9161127.hJ6kbhveRM@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sun, 07 Jul 2013 22:18:30 +0200
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Subject: Re: Regexp confusion
Newsgroups: comp.lang.javascript
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dann90038@gmail.com wrote:

> To JJ

<http://www.netmeister.org/news/learn2quote.html>
<http://jibbering.com/faq/#posting>
<http://PointedEars.de/faq#posting>

> it works for me in js if I use
> \.feed(burner|sportal)\.com\/|feed.*\.gif($|\?)*

Which is nonsense.  Neither can the end of input/line be repeated, nor is 
the “?” allowed to be repeated (unescaped) in a “http(s):”-URI-Reference.
 
> and I get matches on all 3 with the string
> http://feeds.feedburner.com/any
> http://feed.thesite.com/any/blah.gif
> http://feedsite.com/any/blah.gif?var=blah

And you also get a match for

  http://feedsite.com/any/blah.gif??????????var=blah

which certainly is _not_ a valid “http(s):”-URI-Reference.
 
> it also works with
> \.feed(burner|sportal)\.com\/|feed.*\.gif($|\?)
> if my string alone is
> http://feed.thesite.com/any/blah.gif
> 
> so, I'd think there's something after the ".gif" which isn't $ end of
> input or "?" character

RFC 3986, Appendix B, contains a *proper* regular expression for matching 
URIs that can be adapted to result in

  /\.feed(burner|sportal)\.com\/|feed[^?]*\.gif(\?[^#]*)?(#.*)?$/

or (non-greedy matching, probably not worth the incompatiblity here)

  /\.feed(burner|sportal)\.com\/|feed[^?]*\.gif(\?.*?)?(#.+)?$/

It is possible that this is still not what the OP needs as then there can 
only be query-part and fragment-part if a resource name was specified (“/a|
b(c?)/” ≡ “/(?:a)|(?:b(c?))/”).  A more viable solution might be

  /(\.feed(burner|sportal)\.com\/|feed[^?]*\.gif)(\?[^#]*)?(#.*)?$/
   ^                                            ^
or

  /(\.feed(burner|sportal)\.com\/|feed[^?]*\.gif)(\?.*?)?(#.+)?$/
   ^                                            ^
Note the extra parentheses that group the outer alternation.  Also, where 
non-greedy matching is supported, potentially more efficient non-capturing 
parentheses are supported, for example:

  /(?:\.feed(?:burner|sportal)\.com\/|feed[^?]*\.gif)(\?.*?)?(#.+)?$/

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.