Sanitize a string with non-alphanum repetition

Posted by Toto on Stack Overflow See other posts from Stack Overflow or by Toto
Published on 2010-03-28T10:07:32Z Indexed on 2010/03/28 11:23 UTC
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regex

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php

I need to sanitize article titles when (creative) users try to "attract attention" with some non-alphanum repetition.

Exemples:

Buy my product !!!!!!!!!!!!!!!!!!!!!!!!
Buy my product !? !? !? !? !? !?
Buy my product !!!!!!!!!.......!!!!!!!!
Buy my product <-----------

Some acceptable solution would be to reduce the repetition of non-alphanum to 2.

So I would get:

Buy my product !!
Buy my product !? !?
Buy my product !!..!!
Buy my product <--

This solution did not work that well:

preg_replace('/(\W{2,})(?=\1+)/', '', $title)

Any idea how to do it in PHP with regex?

Other better solution is also welcomed (I cannot strip all the non-alphanum characters as they can make sense).

Edit: the objective is only to avoid most common issues. The other creative cases will be sanitized manually or sanitized with an other regex.

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