Trying to avoid comma at end and add space after comma

Question

I am trying to write RegExp for validation

string will be alphanumeric with not having space between words.
after each word comma will be added by user and after that space get added
not allow space and comma in end of word and not allow more than 5 comma separated values

I wrote following regExp code but it fails on second.

^[0-9a-zA-Z]+(\, [0-9a-zA-Z]+){0,4}$

Do you mean `^[0-9a-zA-Z]+(?:, ?[0-9a-zA-Z]+){0,4}$`? That the space is optional? Note [`[A-z]` matches more than just ASCII letters](https://stackoverflow.com/questions/29771901/why-is-this-regex-allowing-a-caret/29771926#29771926). It would help if you show your code. — Wiktor Stribiżew, Oct 01 '19 at 15:40
its get failed on e.g : 1, 2, 3, which ends on comma if added space it shows the error regexp not match — Saurabh Gujarani, Oct 01 '19 at 15:49
Given `1, 2, 3, `, should it fail or not? What about `1, 2, 3,`? Same for `1, 2, 3, 4, 5,` variations — ctwheels, Oct 01 '19 at 15:50
Do you want a regex for live validation? Like `^[0-9a-zA-Z]*(?:(?:,(?: [0-9a-zA-Z]*)?)?){0,4}$` — Wiktor Stribiżew, Oct 01 '19 at 15:55
You can also replace `[0-9a-zA-Z]` with `[^\W_]` to make it shorter if you wish — ctwheels, Oct 01 '19 at 15:58
The current and accepted regexps are the same, so there was no issue in the first place. — Wiktor Stribiżew, Oct 06 '19 at 22:52

score 0 · Accepted Answer · answered Oct 01 '19 at 15:58

0

I think you want:

^[0-9a-zA-Z]+(?:, [0-9a-zA-Z]+){0,4}$

answered Oct 01 '19 at 15:58

MonkeyZeus

1 Answers1