CODEWITHSUNDEEP
c#regexphone-number
David Wilson
David Wilson

Reputation: 42

C# remove telephone number from string

I would like to remove telephone numbers from a string using C#. I have been experimenting using different variations of regex with little success.

I would like a solution that is quick to execute (sub 0.1s if possible) as it will be used extensively in a production environment.

This is the code that I have been testing.

var stringContainingPhoneNumber = "This is some random text, I would like £4.99 for this item, please call me on 07828123456 for further information.";
var numberReplace = new Regex(@"((\d){3}-1234567)|((\d){3}\-(\d){3}\-4567)|((\d){3}1234567)");
stringContainingPhoneNumber = numberReplace.Replace(stringContainingPhoneNumber, "[TELEPHONE REMOVED]");

Upvotes: 0

Views: 1213

Answers (4)

Tyress
Tyress

Reputation: 3653

Assuming UK numbers, for example:

"This is some random text, I would like £4.99 for this item, please call me on 07828123456 for further information or send a fax through (020) 2341 0231 or on (01204) 54203."

This should get just the phone numbers:

[\d\s-\(\)]{10,}

Upvotes: 0

Avinash Raj
Avinash Raj

Reputation: 174834

Just change your regex to ,

var numberReplace = new Regex(@"((\d){3}-1234567)|((\d){3}\-(\d){3}\-4567)|((\d){3}1234567)|(\b(\d){5}123456\b)");

Your regex won't work because in the input string, phone number contains 11 digits but in your pattern , there are only 10 digits. An also it isn't ends with 123456

Upvotes: 0

moikey
moikey

Reputation: 353

This should work for your regex.

\d{11}[\s\d-]+

The number in the regex will match number sequences of that length in the string.

Upvotes: 0

virusrocks
virusrocks

Reputation: 871

You may want to use a phone formatting library to identify valid phone numbers. Than you can replace them with whatever you want. You may use

http://blog.appharbor.com/2012/02/03/net-phone-number-validation-with-google-libphonenumber

Upvotes: 1

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