the match() function

Hi

I get a fatal error when I try to execute the match() function in the form

matches($first, $second, 'i').

I know the problem is becoz of the $second that I pass as the second 
argument. If I change this expression to
matches($first, 'test', 'i')

it executes fine.

Is there a way to allow a variable to be passed in the second argument 
of matches() ?
Thanks
Rahil

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