Chung Leong wrote:
> \w is equivalent to [_a-zA-Z0-9] by the way.

It is /almost/ equivalent:

~$ php -r 'echo (preg_match("/^\w+$/", "Graça"))?("yes"):("no"), "\n";'
yes
~$ php -r 'echo (preg_match("/^[_a-zA-Z0-9]+$/", "Graça"))?("yes"):("no"), "\n";'
no

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