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C:\>perl -MScalar::Util=looks_like_number -e "print looks_like_number 
+'Inf'"
20

looks_like_number EXPR
Returns true if perl thinks EXPR is a number. See "looks_like_number" 
+in perlapi.

C:\>perl -e "use Scalar::Util(looks_like_number); print looks_like_num
+ber 'Inf'"
20
C:\>perl -e "use Scalar::Util(looks_like_number); print looks_like_num
+ber 'foo'"
...
2
C:\>perl -e "use Scalar::Util(looks_like_number); print looks_like_num
+ber(7874321907)"
8704