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Message-ID: <4522206.f2d4svmm8S@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 10 Oct 2013 22:57 +0200
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Subject: Re: regular expression
Newsgroups: comp.lang.javascript
References: <l36qvt$6rq$1@dont-email.me> <1692823.iOv17HgRNK@PointedEars.de> <0.59968aeff2274c0aa6ab.20131010213157BST.8738o827gi.fsf@bsb.me.uk>
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Ben Bacarisse wrote:

> Thomas 'PointedEars' Lahn <PointedEars@web.de> writes:
>> Tony Johansson wrote:
>>> I want to filter this expression
>>> http://localhost:49507/slutProjekt/img/TwinBagel.jpg
> <snip>
>>> by using regular expression so that I only want the string that starts
>>> after the last / and end before the dot.
> <snip>
> 
>>   var s = elmnt.src.replace(/^.*\/([^.]+).*/, '$1');
>>
>> Better:
>>
>>   var m = (elmnt.src.match(/([^.\/]+)(?:\..*?)?$/) || [])[1];
> 
> Not if there is an earlier '.' in the string.

It was not intended as a general solution.

> I think your first RE will do just as well here, though the trailing .* is
> no longer needed:
> 
>   var m = (elmnt.src.match(/^.*\/([^.]+)/) || [])[1];

This is simpler and more general, but less efficient.

-- 
PointedEars

Twitter: @PointedEars2
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