Re: String.replace() with regex

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From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To	Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Date	Sat, 17 Dec 2011 14:12:14 +0100
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Subject	Re: String.replace() with regex
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Jason C wrote:

> I have this regex, which works as expected:
> 
> a = a.replace(/ itxtHarvested="(.*?)"/i, "");
> 
> I modified it to this:
> 
> a = a.replace(/\s*itxtHarvested="*(.*?)"*/i, "");
> 
> which I thought would be the same, but would make the /s and " optional.

How can it be the same then?  It would make leading white-space, and 
optional in that it would allow 0 or more of them, including `"""""'.
(This is probably not what you want.)

> But, in practice, instead of just removing it, it was being converted to
> something like:
> 
> 441?0?
> 
> (Or maybe 530"0"; I had made several modifications using the *, and now I
> don't remember which error went where.)

No, it was not.

> Does the * not mean "0 or more times" in Javascript like it does in other
> languages?

There is no "Javascript": <http://PointedEars.de/es-matrix>

The `*' means the same in ECMAScript implementations as in other programming 
languages.

> I know that a few things are different with JS (like the /s
> modifier), so I wasn't sure.

ECMAScript Regular Expressions do not natively support several PCRE 
features, but you can emulate some.  I have recently finished emulating 
support for Unicode character property escape sequences, named subpatterns, 
and the `x' modifier:

<http://pointedears.de/websvn/filedetails.php?repname=JSX&path=%2Ftrunk%2Fregexp.js>

> Or, is it just something flawed in my logic that made it not work as
> expected?

Both your logic and your question are flawed.

<http://jibbering.com/faq/#posting>
<http://catb.org/~esr/faqs/smart-questions.html#beprecise>

PointedEars
-- 
var bugRiddenCrashPronePieceOfJunk = (
    navigator.userAgent.indexOf('MSIE 5') != -1
    && navigator.userAgent.indexOf('Mac') != -1
)  // Plone, register_function.js:16

Thread

String.replace() with regex Jason C <jwcarlton@gmail.com> - 2011-12-17 02:42 -0800
  Re: String.replace() with regex Stefan Weiss <krewecherl@gmail.com> - 2011-12-17 14:08 +0100
  Re: String.replace() with regex Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-12-17 14:12 +0100
  Re: String.replace() with regex Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-12-17 18:31 +0100

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