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From jquery.validate.js, this regex is used to validate a number. The problem is that it fails on .33 and passes on 0.33. I need to make it pass with, or without, the leading 0.
^-?(?:\d+|\d{1,3}(?:,\d{3})+)(?:\.\d+)?$
A positive lookahead such as
(?=[.])can be used to ensure that the strings either starts with a dot (.) or follow the previously defined pattern.