regex value is between (but not including) 0 - 32

Question

my current regex:

/^[0-9]{3}$/

This will match if the value is an integer with a length of 2.

I need to expand this a bit further by matching only values between 0 - 32.

0 <- not match
1 <- match
2 <- match
...
29 <- match
30 <- match
32 <- not match
33 <- not match

@UlugbekUmirov can you put your comment in an answer and tell me exactly what is happening? by the way it works. — , Apr 04 '15 at 16:16
if a number is between two numbers then 0 and 32 are not included. — , Apr 04 '15 at 16:19
@UlugbekUmirov, Putting your regex in [regex101](https://regex101.com/r/qV4xN2/2), it doesent seem to work there.. — Jonas Czech, Apr 04 '15 at 16:29
@JonasCz: you need to add the `gm` flags since you have more than one and multiple lines in the regex — dawg, Apr 04 '15 at 16:51

dawg · Answer 1 · 2015-04-04T16:48:01.813

2

This works:

/^((?:[1-9])|(?:[1-2][0-9])|(?:3[0-1]))$/

Test it in Python:

for i in range(0,321):
    m=re.match(r'^((?:[1-9])|(?:[1-2][0-9])|(?:3[0-1]))$', str(i))
    if m:
        print i
# prints 1-31...

Test in Bash / Perl:

$ echo {0..3500} | tr ' ' '\n' | perl -nle 'print $1 if /^((?:[1-9])|(?:[1-2][0-9])|(?:3[0-1]))$/'
prints 1-31

And test in regex101

edited Apr 04 '15 at 16:48

answered Apr 04 '15 at 16:25

dawg

score 0 · Answer 2 · answered Apr 04 '15 at 16:21

0

Required regex can be formed like this

/^[1-9]$|^[1-2][0-9]$|^3[0-2]$/

Also, the given regex will match only 3 digit integers.

answered Apr 04 '15 at 16:21

Vikas Bansal

Seems like OP wants a regex to match 0 - 32, not a 3 digit integer.. – Jonas Czech Apr 04 '15 at 16:23
Can you break the regex apart and describe what is happening? i need to be able to use this same statement for another number. I'm starting to think i cant do what im trying to do. – Apr 04 '15 at 16:24
There are three parts in this regex. `^[1-9]$` matches any number between 1-9. `^[1-2][0-9]$` matces a number between 10 and 29. `^3[0-2]$` will match an integer between 30 and 32. You can try them separately. @JonasCz by "given regex" i meant the regex which is mentioned in the question. – Vikas Bansal Apr 04 '15 at 16:33

2 Answers2