Regex to check a string with presence of : (colon) and . (dot)

Question

Mandviwala, Abdeali 21

Hello,

I need to check the validation of format of a string for which i am planning to use Regex. Below is my string format

subject:Patient.name

and also for the presence of string in the below format:

subject.name

I need to validate the above formats exactly as they are. I am thinking of having two different regex for them.

Please suggest how can it be implemented using Regex.

Regards,
Abdi

Accepted answer

0 additional answers

Answer 1

Viorel 122.6K

If letters and digits are allowed, then try this expression (for both cases):

^(\w+)(:\w+)?\.(\w+)$

If digits should not be permitted, then use \p{L} instead of \w.

Mandviwala, Abdeali 21 Reputation points

2022-08-29T09:50:04.85+00:00

Thanks.

I need only alphabets (a-z or it can be A-Z) and not numbers/digits.

The expression \p{L} is not working as it is trying to match the alphabet p and L.
Viorel 122.6K Reputation points

2022-08-29T10:04:57.343+00:00

Probably you did not use \p{L} correctly. Are you using the Regex class or some validation attributes? Show some details.
Mandviwala, Abdeali 21 Reputation points

2022-08-29T10:06:43.727+00:00

I am using https://regexr.com/ to test the \p{L}.

^([\p{L}]+)(:[\p{L}]+)?.([\p{L}]+)$
Viorel 122.6K Reputation points

2022-08-29T10:10:31.207+00:00

It seems that it cannot be used for C# because it only supports JavaScript and PCRE.

Try testing the regular expressions in your code, or find an appropriate tool that supports the .NET.
Mandviwala, Abdeali 21 Reputation points

2022-08-29T10:14:06.86+00:00

Yes in C# I am using the below achieve this:

^([A-Za-z]+)(:[A-Za-z]+)?.([A-Za-z]+)$

Thank you for your replies.