Get text between A and B?

From: Philipp Lenssen (info_at_outer-court.com)
Date: 11/17/03 

Date: 17 Nov 2003 18:40:21 GMT

I want to read out several strings from an HTML (text) file, like
everything between "<h2>" and "</h2>" to create a table-of-contents
(also, things other than tags).
I do have a function but it's slow, and sometimes doesn't finish for
larger files (600K, not much really!).
Now what would be a nice function to do this job? I suppose some regex
with preg_match_all?

It should have a parameter telling which occurrence of the string
should be used, e.g. the second, third and so on.

------------

Like:

function getTextBetween($allText, $textBefore, $textAfter, $offset = 0)
{
    // ?
}

Then I could say:

$s = getTextBetween("<h2>foo</h2><p>Hello World</p><h2>bar</h2>",
        "<h2>", "</h2>", 1);
echo $s; // ... would be "bar"

------------

Any help greatly appreciated!

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