Regular Expressions

[ThePsion5]

Ok, I'm using the following regular expression to try and match HTML frame tags:

<(frame|FRAME)[\s\S]*?/(\1)?>

To break it down:<(frame|FRAME) Should match the opening tag[\s\S]*? Should match any number of letters or numbers inside the tag/(\1)?> Is a back reference to the first subpattern (frame|FRAME) plus the closing slash and bracket, and should match the closing tags /frame>, /FRAME>, or />This seems correct to me, but so far i'm not getting any matches for my test data...any ideas?

[adservio]

How about using the "i" pattern mod for ignore case and escaping the \ in \1.

<?php$html ="<FRAME src='test.html'></FRAME>";$re = "/<(frame)(.*)><\/\\1>/i";echo preg_match($re, $html, $matches);print_r($matches);?>

HTH

[ThePsion5]

That actually worked out very well, thanks :)Now I have another, slightly more complex difficulty - I'm trying to parse out the attributes of a HTML/XML tag using a regular expression, this is what I have so far:This code matches the tag itself:

<[\s\S]+>

And this code matches the attributes and their respective values:

 [\S]+[\s]*=[\s]*(\'|")?[\s\S]+(\1)

I break the second regular expression down like this:[\S+[\s]? - At least one letter+ 0 or more spaces=[\s]*(\'|")? - The equal sign plus 0 or 1 opening quotations[s\S\]+(\1) - The contents of the attribute (1 or more characters) and the closing quotations (back referencing the quotation subpattern)Is this anywhere near correct? lolEDIT: I've been trying the aforementioned regular expression using this test data:

href="www.google.com" title="Google"

With the preg_grep() function...unfortunately, it returns the entire string as a single match, while I would like the expression to return each attribute as a match...What might I be doing incorrectly? Thanks in advance!

[adservio]

Still Make my Brain Hurt

Me to0o0, you got off in the deep water Here's something that might help you.haacked.comThen you have to consider those nested tags. :)EDIT:One thing I can recommend is to make the patterns include newlines:

<?php$html ="<FRAMEsrc='test.html'></FRAME>";$re = "/<(frame)(.*)><\/\\1>/is";echo preg_match($re, $html, $matches);print_r($matches);?>

[ThePsion5]

Unfortunately, I'm still stuck on my second regular expression designed to match attributes. My modified regular expression looks like this:

\w+\s*=\s*("|')?[^\1]+\1

\w+\s* - Matches 1 or more 'word' characters and any number of whitespace characters=\s*("|')? - Matches the equal sign, any number of whitespace characters, and 0-1 single or double quote values[^\1]*\1 - Matches a 0 or more characters not equal to the end quote and the end quote itselfI'm still not sure why this doesn't work...testing it with the string href="http://www.google.com" title="Google" returns the entire string as a match. Any ideas?EDIT: I've tried breaking th regex into bits and work with them from their...this is the segment that should match the attribute values: =("|\')[a-zA-Z]+\1But this returns the entire test string as well, which seems very strange to me...I wonder what may be up? I feel like I'm missing something very basic.

[adservio]

Try the "ungreedy" modifier.

$re = '/\w+\s*=\s*("|\')?[^\1]+\1/U';

http://us2.php.net/manual/en/reference.pcr...n.modifiers.php

[ThePsion5]

Hah, that's what the problem is, then. It works now without any problems. Thanks!