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Perl: How to find a numric value preceding a string

Hi Experts,

I need to find the number in the following string.

THREAD_NAME: spent time 34.4 (units %)
I want to get the 34.4 from this line.  The numeric value will always precede the (units %) string.  But the other words in the string will vary.

Thank you.
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You can also try this one:

my ($number) = $string =~ m/([0-9.]+)\s*\(units/;

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