> 
> Thank you!  I did not know about the ucwords() functions, and it
> does not need the string set to lower case.
> 
> Now to create a filter that returns only numbers (e.g. "a1234z"
> -> "1234") and the same for non-numbers.
> 

[Peter Lauri - DWS Asia] 

This to replace all non-digit characters with ""

$string = preg_replace("/\D/", "", $string);

And this to replace all non-character characters with ""

$string = preg_replace("/\W/", "", $string);

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