From: Glenn Jackman <glennj@...>
Date: 2010-08-12T03:15:05+09:00
Subject: Re: Hel;p with Tip Calculator

At 2010-08-11 01:03AM, "jason joo" wrote:
>  [Note:  parts of this message were removed to make it a legal post.]
>  
>  aha, i forgot positive number and dot. then the regular expression should
>  be /([\-+]?\d*[.]?\d*)/

The empty string matches that pattern (all your quantifiers allow zero
of the previous item).  You want:

    /[-+]?(?:\d+(\.\d*)?)|(?:\d*\.\d+)/

where there must be at least one digit.

-- 
Glenn Jackman
    Write a wise saying and your name will live forever. -- Anonymous