Re^2: Regular expression for hexadecimal number

No!

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....

Comment on Re^2: Regular expression for hexadecimal number Download Code

Replies are listed 'Best First'.
Re^3: Regular expression for hexadecimal number by Fletch (Bishop) on Jul 30, 2007 at 13:35 UTC
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 . . .	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^3: Regular expression for hexadecimal number
by Fletch (Bishop) on Jul 30, 2007 at 13:35 UTC

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 . . .

[reply]
[d/l]
[select]