The (?:.....) construct allows paranthetical constraining without capturing.

my @qty = 'GARNIER DEODORANT MINERALS - DRY CARE (50OZ)' =~
    m/
      \(
      ([+-\d.eE]*\d+)
      (?:KG|OZ|CL|LT|LTR|M)\b
      \)
    /igx;
[download]

I also made a couple of functional changes to your RE, which may or may not be appropriate, but which I suspect are in keeping with what you're after:

• I allowed more than one \d digit, with \d+. Your RE captures up to two digits, but only one digit if there is a leading +, -, '.', e, or E. My example will capture however many consecutive digits present themselves. Be aware, however, that if you've got some number written in scientific notation I *think* you're still only capturing the exponent, not the mantissa.
• I moved the word boundary \b outside of the constraining brackets so that it applies to KG, OZ, CL, LT, LTR, or M. Your example made it only apply to M. In other words, KG didn't require a word boundary, but M did, as in 'M\b'.
• I added the /x modifier to the RE so that it could be written in chunks with non-significant whitespace. This allows your code to be more readable.

Have a look at perlre for a description of both (?:....) and the /x modifier.

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