Regex for numerical range, show 1 and 01, but reject 0 and 00 -


i've puzzled lot, can't figure out why regex doesn't work. it's input should accept numerical range between 0 , 40. should reject 0 , 00, accept 1 or 01 , further...

where wrong?

\b([1-3]?\d{1}|40)\b

[1-3]?\d{1}

matches 0 because [1-3] optional , \d of course includes 0. also, {1} no-op - every token matched once definition.

you need this:

\b(0?[1-9]|[1-3]\d|40)\b

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