regexp matching- real simple!

[Nandita Mullapudi]

This has to be really easy- but I cant get it to work:
I want my script to carry out a loop only if the number stored in 
$diff is positive,
so i say
if ($diff =~m/^[-\d+]/) {blah blah}
but it won't work. why?
TIA
-Nandita

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