Question

I want VB.NET regular expression for below format

7966-591739

I mean user must have to enter 4 numeric characters first then “-“ and then 6 numeric characters after that optional for numeric as well as for characters. In my case user can also enter

7966-591739 ext 562

7966-591739 x 434

Please suggest!

Answer 1

I belive that UK number often have 5 digits before your ‘-‘ character.

I’ve updated @NawaMan’s answer to make it run and to remove the capturing groups:

^[0-9]{4,6}\-[0-9]{6}(?:\s(?:ext|x)\s[0-9]{3,4})?$

And here to capture the number groups:

^([0-9]{4,6})\-([0-9]{6})(?:\s(?:ext|x)\s([0-9]{3,4}))?$

And here is the expression cleaned up:

^(\d{4,6})\-(\d{6})(?:\s(?:ext|x)\s(\d{3,4}))?$

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UPDATED – To as per OP’s request.