textpos() function

I just upgraded to postgresql 7.0 and was restoring my data when I
noticed I had a function defined that used the builtin textpos()
function.  This function was available in 6.5.3 but seems to have
dissapeared in 7.0..  Is there any way to restore this function or has
it been renamed to something else (i found strpos() but i'm not sure if
that does exactly the same thing).

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