[thelist] Regular Expression - Is it a bug or am I missing something very obvious?

VOLKAN ÖZÇELİK volkan.ozcelik at gmail.com
Thu Mar 10 04:27:32 CST 2005


what about the last ">" ?

you tested it as


but it should be


If the last ">" weren't there you were right. But now it should
account for the final ">" as well isn't it?


---------- Forwarded message ----------
From: Jeffery To <jeffery.to at gmx.net>
Date: Thu, 10 Mar 2005 04:50:07 -0500
Subject: Re: [thelist]  Regular Expression - Is it a bug or am I
missing something very obvious?
To: "thelist at lists.evolt.org" <thelist at lists.evolt.org>

It's matching what you're telling it to match:

'</p>'.match(/<\/?(?!p)/) returns '<' because the string '<' contains
the character '<', zero occurrences of the character '/' and is not
followed by the character 'p' in the source string. (It is followed by
the character '/'.)


> Hi Community, hi RegExp lovers!
> Regarding the following js reg exp.
> /<\/?(?!(p))/ig;   (It's a simplified version of what I'm working on)
> I think what it is supposed to do is:
> 1. match character < literally
> 2. match craracter / literally (zero or one times)
> 3. If there is a p immediately after do not match anything, just
> rollback (i.e. negative lookahead)
> so the code below
> var strTest1 = "</p>";
> var regEx1 = /<\/?(?!(p))/ig;
> strTest1 = strTest1.replace(regEx1,"")
> alert(strTest1);
> should alert "</p>".
> Well it doesn't. It alerts "p/>". Which means that it has found a match.
> I need to swap things around to make it work:
> var strTest2 = "</p>";
> regEx2 = /<(?!(\/p|p))/ig;
> strTest2 = strTest2.replace(regEx2,"")
> alert(strTest2);
> but why on earth do I need to make things unnecessarily complicated ?!
> The first one should work at least according to my humble logic!
> Is it a bug? Or am I missing a really simple thing?
> Please help me before I split this PC with an axe.
> TIA,
> Volkan.

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