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Re: Regular expression for hexadecimal number

by mickeyn (Priest)
on Jul 30, 2007 at 12:58 UTC ( #629545=note: print w/replies, xml ) Need Help??

in reply to Regular expression for hexadecimal number

do mean something like m/0x[0-9a-f]+/ ?


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Re^2: Regular expression for hexadecimal number
by ww (Archbishop) on Jul 30, 2007 at 13:16 UTC


    No downvote, but your regex misses the limit of 1 to 4 "f"s in OP's statement of the problem.

    See FunkyMonk's prior reply (which <span class="pedantic picky)"> errs (albeit, in it's original form, and only marginally) in the comment at line 4:

    {1,4}  #   between 1 & 4 of them

    only insomuch as the set of integers between "1 & 4" includes only "2" and "3."</span>

    Hmm... :-) maybe the "picky pedantic" tag should enclose this whole note....

      Depends on whether one reads "between 1 & 4" as [1,4] (inclusive; which is what the regex notation used implements) or (1,4) (exclusive; which would be {2,3}). Given that the inclusive sense was implied by the code itself one could probably overlook it (of course there's a huge potential for debate on whether an unqualified between should be read as one or the other . . . :)

      (And if you want pedantic nits to pick, one could also have knocked everyone's use of [0-9a-f] rather than [[:xdigit:]] . . . :)

      Update: Bah, it's [[:xdigit:]] not [[:hexdigit:]]. Never try and pedant before caffeine . . .

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