Validate a UK phone number

Question

How do I validate a UK phone number in C# using a regex?

Answer 1

There is a good searchable catalog of regular expressions at the Regular Expression Library. There is at least one regular expression for UK phone numbers in this catalog.

Answer 2

Well the format of a UK phone number is 0[areacode x4][numberx6] however I think that changes per region - it's definitely applicable for my region which has a 4 digit area code by Bristol for example has a 3 digit code.

I'm not too good at regex but this works for me (in preg mode):

0[1-9]{3,4}[0-9]{6}

Answer 3

@Ross

That doesn't take into account spaces (e.g. 01234 567890) or internationalisation (eg +44 1234 567890)

Although, if the OP doesn't want to take those factors into account, that's not an issue.