You could probably use something like this: 
my ($f) = $s =~ m{FREE: (\d+)} or die 'no FREE';

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But AnomalousMonk's proposal is arguably more readable.

Also, the \s* makes is possible to cope with possible variations in the number of spaces between FREE: and the value. Perhaps you don't need it if you can be absolutely sure that there will always be one and only one space there, but can you be that sure?

In reply to Re^3: March a regex using split function by Laurent_R
in thread March a regex using split function by sreek3502

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