Replace Tag with given attribute... HELP!

[soaptray]

Hey there,

I will make this nice and short...

I have...
[b]"<p class="level2_heading" align="center">Heading Here</p>"[/b]

and I want to have php find and replace with...

[b]"<h3 align="center">Heading Here</p>"[/b]

Can anyone help me create a regex to find this, and replace the needed parts? I am stumped.

[sinisake]

[code]
<?php
$input='This is some text: <a href=http://www.google.com>Click</a>
<p class="level2_heading" align="center">that is it</p>';
$patern="<p class=\"level2_heading\" align=\"center\">+.+</p>";
$replace='<h3 align="center">Heading Here</p>';
if(eregi($patern,$input,$match)){
$input=str_replace($match,$replace,$input);
echo $input;
}
?>
[/code]
I hope that's it :)

[Nicklas]

[CODE]<?php

$string = '<p class="level2_heading" align="center">Heading Here</p>';
echo preg_replace('~<p[^>]+>(.*?)<\/p>~is', '<h3 align="center">\\1</h3>', $string);

?>[/CODE]

Are you sure you want to keep the ending </p> tag and not change it to </h3> as in the example above ?
If you want to keep the </p> tag, replace preg_replace() with this:

[code=php:0]preg_replace('~<p[^>]+>(.*?)(<\/p>)~is', '<h3 align="center">\\1\\2', $string);[/code]