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Re: regular expression

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RobG wrote:

> On Friday, October 11, 2013 4:17:28 AM UTC+10, Tony Johansson wrote:
>> I want to filter this expression
>> http://localhost:49507/slutProjekt/img/TwinBagel.jpg
>> by using regular expression so that I only want the string that starts
>> after the last / and end before the dot.
>> In this example I want just TwinBagel.
>> I have this expression elmnt.src.replace(/^.*[\\\/]/, '');
>> but this will also return the string after the dot which I don't want.
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> I not a fan of strategies that result in overly complex regular
> expressions or are unnecessarily restrictive on the input.
> 
> Consider using two steps:
> 
>   // Get the characters after the last /
>   var m = s.match(/[^\/]+$/g);

The global modifier is pointless here.

>   // Remove characters after the last '.', guarding against
>   // errors if no match was found
>   var result = m && m[0].replace(/\.[^\.]*$/,'');

“.” does not need to be escaped in a character class in order to mean a 
literal dot.
 
> The above won't throw an error in the case that match fails to find a
> match (and returns null), and will also allow for file names like
> "Receipts.2013.10.12.csv", but it will unconditionally remove everything
> after the last period character (.).

Which is _not_ what was asked for.

-- 
PointedEars

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

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regular expression "Tony Johansson" <johansson.andersson@telia.com> - 2013-10-10 20:17 +0200
  Re: regular expression "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-10-10 20:29 +0200
  Re: regular expression Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-10-10 21:33 +0200
    Re: regular expression Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-10-10 21:31 +0100
      Re: regular expression Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-10-10 22:57 +0200
        Re: regular expression Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-10-10 23:56 +0100
          Re: regular expression Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-10-11 01:06 +0200
            Re: regular expression Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-10-11 01:21 +0100
  Re: regular expression RobG <rgqld@iinet.net.au> - 2013-10-10 18:48 -0700
    Re: regular expression Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-10-11 11:42 +0200
  Re: regular expression dhtml <dhtmlkitchen@gmail.com> - 2013-10-16 10:19 -0700

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