help with a way from making links using regex or an easier way

[turkman]

Hey im making a forum and when people enter posts it strips the html... i do however want to give people the option of linking to an earlier post.

 

i.e say the post reference was 10001

 

in their post they could type  #10001 and the php would recognise the # as wanting to make a link and would change it to

<a href = '#10001'>#10001</a>

 

Is this easily done?

 

[sasa]

try

<?php
$test = 'blah #123 blah blah #4567 #sasa';
$out = preg_replace('/#[^ ]+/', '<a href=\'$0\'>$0</a>', $test);
echo $out;
?>