PCRE regex result is different between Linux & Windows.

Hi, [I precede you, sorry for language mistakes...] I have done a pretty regex which can normally strip all the empties HTML tags. With PHP v5.2.4, under Windows XP, preg_replace() gives me 90 matches (which is correct) while under linux it stagnate to 54. Let me introduce this regex : $pattern = ' @

<([a-z0-9]+)[^>]*>     # open tag

(?:[\s|(?: )]*| # white characters (ugly ?)

    (?R))*             # recursion (parent tag is empty to ?)
</\s*\1\s*>            # close tag

@Sux'; // I love those pattern's options !! :-D) So, is it normal that I have this big difference for matches (Windows vs Linux) ? I thought it was a recursion trouble so I include the preg_replace() in a do/while structure. It did not change anything... If anyone can tell me about it, it will be a pleasure ! -- Julien