I don't see the point of using a regexp to solve this type of problem. I'd do something like: 

if ( eval { use warnings FATAL => 'numeric'; $_num < 1 && $_num >= 0 }
+ ) {

  # $_num is OK...

  $_num =~ /(.*)/;
  $_num = $1;       # untaint $_num

  # ...

}

[download]

Update: Thanks to VSarkiss for pointing out the untainting aspect of the problem. I have added untainting code to take care of this. Even with this added requirement I don't see the point of using a regexp to both untaint and check the numeric properties of the variable.

the lowliest monk

In reply to Re: Match number >= 0 and <1 by tlm
in thread Match number >= 0 and <1 by lupey

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