I created a custom field of the type Enter one value and used the input validation of Digits.
Interestingly, "0" is not a valid input. "1" and "00" are valid input. "-0" and "-1" obviously do not match the "^[\d.]+$" regular expression. I have tested this on RT 4.2.2 and IE10 and FF27. My Regexp packages are 2013031301. Re is 0.09 Keith Schincke
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