Need regex to match 1 or more of exactly n-digit numbers

Question

I need a regex to match a series of one or more n-digit numbers, separated by comma, ie:

abc12345def returns 12345
abc12345,23456def returns 12345,23456

so far I got this: \d{5}(,\d{5})*

problem is it also matches in cases like these:

123456 returns 12345, but I need it not to match if the number is longer than 5. So I need numbers of exactly 5 digits, and if a number is shorter or longer it's a no-match

Thanks

Answer 1

Which language are you using for your regexes? You want to put non-digit markers around your \d{5}'s; here is the Perl syntax (with a negative look-ahead/look-behind fix by Lukasz):

(?<![\d,])\d{5}(,\d{5})*(?![\d,])

Answer 2

Actually I think I got it! (?<!\d)\d{5}(?!\d)(,(?<!\d)\d{5}(?!\d))*

I used the look-ahead and look-behind

Thanks.