in reply to Re^2: Regex for max length float
in thread Regex for max length float

If you say in your OP that 1 is valid then your regex will fail for that value because it expects to find a decimal point. Perhaps \.? making it optional would be better?

Cheers,

JohnGG

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Re^4: Regex for max length float
by agianni (Hermit) on Mar 14, 2007 at 16:27 UTC

    Hmm... yes, but it's not really just the decimal that's optional, right? It's the decimal and the trailing digits. So something like this: 

    $float =~ m/
            \A             # beggining of string
            \d{0,$max_lhs} # 0 to $max_lhs digits
            (?=            # non capturing grouping
            \.             # decimal point
            \d{1,$max_rhs} # 1 to $max_rhs digits
            )?             # grouping is optional
            \z             # end of string
           /xms;

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    should do it, right? I haven't had a chance to test it, but that's the correct use of (?= )?, right?

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      (?:...) is non-capturing grouping.
      (?=...) is zero-width positive lookahead, which isn't appropriate here.

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