regular expressions - phone number and extension

Posted on 2009-04-09
Medium Priority
Last Modified: 2012-05-06
We are trying to use regular expressions to check a valid phone number.  We have a pattern but we want to add an option for an extension.
phonePattern = @"\((?<AreaCode>\d{3}) \)?[-\s]? (?<Prefix>\d{3}) [-.] (?<Number>\d{4})";
would this work
phonePattern = @"\((?<AreaCode>\d{3}) \)?[-\s]? (?<Prefix>\d{3}) [-.] (?<Number>\d{4}) x?<ext>\d{10}";
Here are some valid examples for phone numbers
555-123-4567 x1234
555-123-4567 x 1234
555-123-4567 x778942
Question by:tampsystems
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2

Expert Comment

ID: 24108489
ok. So, valid examples are:
555-123-4567 x1234
555-123-4567 x 1234
555-123-4567 x778942
e.g. <3 digits><-><3 digits><-><4 digits>#extension Part#<space><x><optional space><4 to 6 digits>

let me put regexp in a simpler form.

this will match all the number formats, mentioned above. A better solution can be made if you know the next character after a number e.g. new line/carriage return.
Hope this helps.

Author Comment

ID: 24116526
I want to be able to support () spaces and dashes
(555) 123 4567
(555) 123-4567
555 123 4567
555 123-4567
555 1234567
555123 4567
And the optional extension number
LVL 13

Expert Comment

ID: 24119510
The following regular expression matches your formats, and the following:

(123) 123-4567 1234
(123) 1234567 1234
(123) 123-4567
(123) 1234567
123-4567 1234
1234567 1234


Open in new window

LVL 13

Accepted Solution

numberkruncher earned 2000 total points
ID: 24119551
Sorry, I just noticed that you wanted an "x" on your extension number.

The below regex matches:

(123) 123-4567 x1234
(123) 1234567 x1234
123-4567 x1234
1234567 x1234

(123) 123-4567 x 1234
(123) 1234567 x 1234
123-4567 x 1234
1234567 x 1234

(123) 123-4567x 1234
(123) 1234567x 1234
123-4567x 1234
1234567x 1234

(123) 123-4567x1234567890
(123) 1234567x1234567890


Open in new window


Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

by Batuhan Cetin Regular expression is a language that we use to edit a string or retrieve sub-strings that meets specific rules from a text. A regular expression can be applied to a set of string variables. There are many RegEx engines for u…
We are witnesses that everyone is saying that our children shouldn't "play" with a technology because it is dangerous. This article is going to prove that they are wrong.
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Suggested Courses

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question