At 04:32 PM 5/8/2008, Steve Willoughby wrote:
On Thu, May 8, 2008 14:40, Dick Moores wrote:
> At 01:30 PM 5/8/2008, Steve Willoughby wrote:
>>On Thu, May 8, 2008 12:40, Dick Moores wrote:
>> > But here's a chance to ask: What regex would match 2-digit strings
>> > and 4-digit strings only?
>>
>>^\d\d(\d\d)?$
>
> Ah. And so ^\d\d(\d\d)?(\d\d)?$ matches all and only 2-, 4-, and
> 6-digit strings. Which makes me wonder if there's a regex for ALL
> and only strings of digits only, with an even number of digits.
That would be r'^\d\d(\d\d)*$'
OK!
I bought RegexBuddy (<http://www.regexbuddy.com/>) today, which is a
big help. However, it has a comment about your regex--I think it's
saying you are wrong--tho it sure does the job for me with
VALID
12
1234
123456
12345678
1234567890
1234567890112345678901
INVALID
1
123
12345
1234567
123456789
12345678901
123456789011234567890
in matching all the valids and none of the invalids.
What say you? See <http://www.rcblue.com/Regex/all_even_number_of_digits.htm>
Thanks very much,
Dick
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