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Message-ID: <1458401.hGLh0OfnHy@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sun, 01 Sep 2013 15:25:24 +0200
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Subject: Re: Recommendation for new RegExp (Array-extra-like) methods
Newsgroups: comp.lang.javascript
References: <ac07e89f-90ee-4b6d-a524-5adfadd0cb94@googlegroups.com> <3573991.qt74eh6WeI@PointedEars.de>
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Xref: csiph.com comp.lang.javascript:21138

Thomas 'PointedEars' Lahn wrote:

> You might instead find my jsx.regexp.RegExp useful, which among other
> features allows you to name subpatterns and access by that name the
> corresponding matches:
> 
>   /* ?<Perl> style; also supports ?'Perl' style and ?P<ython> style */
>   var regex = new jsx.regexp.RegExp("^(?<first>.+?): (?<second>.+)$",
>   "mg"),
>       str = "key1: val1\nkey2: key2",
>       match;
> 
>   while ((match = regex.exec(str)))
>   {
>     console.log(match.groups["first"], match.groups["second"]);
>     console.log(match[1], match[2]);
>   }
> 
> “regex” holds an augmented RegExp instance then, whose inherited exec()
> method has been overridden in the instance to return an augmented
> array-like object if necessary (otherwise just the inherited method is
> called, and its return value returned):
> 
>       /**
>        * @function
>        */
>       exec: (function () {
>         var rx2;
> 
>         /**
>          * @param {string} s
>          * @param {jsx.regexp.RegExp} rx
>          *   Instance to be tested
>          * @return {boolean}
                     ^^^^^^^^^
>          *   <code>true</code> if <var>rx</var> has been constructed
>          *   using this constructor, <code>false</code> otherwise.

JFTR: As you can see further below, this is a documentation bug that will be 
fixed in the next revision.  The return value of the custom method is 
exactly what the original RegExp.prototype.exec() method would have had 
returned (“null” or a reference to an Array-like object), augmented with 
custom properties if there is a match.

-- 
PointedEars

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