Re: RexExp help: Highlight keywords in CGI search results, unless inside an HTML tag

Completely un-optimal, completely un-tested.. but I think I can get away with something like that from your code?

$newline =~ s|(?<!\<)$keyword(?!\>)|<font style="BACKGROUND: #ffffff">
+$keyword</font>|img;
[download]

The (?<!\<) implies that this shouldn't match a < before the $keyword, and the (?!\>) shouldn't match a > after it... so it's not in a tag.(I guess)

He who asks will be a fool for five minutes, but he who doesn't ask will remain a fool for life.

Chady | http://chady.net/

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Re: Re: RexExp help: Highlight keywords in CGI search results, unless inside an HTML tag by suaveant (Parson) on Jan 15, 2002 at 02:23 UTC
There is nothing wrong with having a < before or a > after it.. so long as the < has a > after it before and vice versa for after.... so I don't think yours will quite work... I came up with the following... which seems to work at least somewhat... `s\|(\Q$text\E)(?![^<]>)\|<I>$1</I>\|gi;` [download] which matches the text so long as it is not followed by a > before it sees a < Update* \me laughs as joealba and I both post the code I gave him at the same time... - Ant - Some of my best work - (1 2 3)	[reply] [d/l]
Re: Re: RexExp help: Highlight keywords in CGI search results, unless inside an HTML tag by joealba (Hermit) on Jan 15, 2002 at 02:20 UTC
Thanks, Chady! suaveant gave me this little hunk of code that seems to be working great: `$text =~ s\|($keyword)(?![^<][>\Z])\|<B>$1</B>\|img;` [download] I've never used that explicit lookahead before. I love/hate it when I'm shown something so useful (when I should have known it before). I KNOW* I read pp. 228-230 of Mastering Regular Expressions one day last year... :)	[reply] [d/l]