需要正则表达式匹配1个或更多正好n位数字

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.

Answer 3

You could use this one:

/\D?\d{5}(?:,\d{5})?\D?/

explanation:

/   : regex delimiter
\D? : non digit optionnal
\d{5}   : 5 digits
(?: : begining of non-capture group
,\d{5}  : comma and 5 digits
)?  : end of group optionnal
\D? : non digit optionnal
/   : regex delimiter