I need a regular expression to convert US tel number to link

Question

Basically, the input field is just a string. People input their phone number in various formats. I need a regular expression to find and convert those numbers into links.

Answer 1

Here's a regex I wrote for finding phone numbers:

(\+?\d[-\.\s]?)?(\(\d{3}\)\s?|\d{3}[-\.\s]?)\d{3}[-\.\s]?\d{4}

It's pretty flexible... allows a variety of formats.

Then, instead of killing yourself trying to replace it w/out spaces using a bunch of back references, instead pass the match to a function and just strip the spaces as you wanted.

C#/.net should have a method that allows a function as the replace argument...

Edit: They call it a `MatchEvaluator. That example uses a delegate, but I'm pretty sure you could use the slightly less verbose

(m) => m.Value.Replace(' ', '')

or something. working from memory here.