how to avoid Nested qualifier in my c# regex expression

Asked Sep 06 '19 at 08:56

Active Sep 06 '19 at 08:56

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I am trying to use regular expression to validate input such as:

aa,bb,c1  or T1

basically a comma separated string and each item should be at most 2 character long.

This is what I come up with:

^([a-z0-9\s]{2}+,)*([a-z0-9\s]{2}+){1}$

I tried in regex101 and it does want I want. However, when I put this into c#, it throws Nested qualifier exception.

I admit that my knowledge of regex is low, can anyone point out what kind of regex expression should I write for c# world?

asked Sep 06 '19 at 08:56

daxu

NET regex does not support possessive quantifiers – Wiktor Stribiżew Sep 06 '19 at 08:59
then what kind of expression should I write for c# in my scenario? – daxu Sep 06 '19 at 09:01
Just replace `{2}+` with `{2}`. Note `{1}` makes no sense and does nothing in any regex, never use it. – Wiktor Stribiżew Sep 06 '19 at 09:03

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