How to validate Fax Number of diffirent countries

Question

Scott Lysle · Answer

Add using System.Text.RegularExpressions; to your class. This function will validate the content of the textbox against a regular expression; the regex provided below is supposed to validate on US and international telephone numbers. If this regex does not work for you visit http://regexlib.com to figure out or find an example that does what you are looking for. private bool PhoneNumberIsValid( string textToValidate) { Regex TheRegExpression; string TheTextToValidate; string TheRegExTest = @(1\s*[-/\.]?)?($(\d{3})$|(\d{3}))\s*([\s-./\])?([0-9]*)([\s-./ \])?([0-9]*) ; TheTextToValidate = textToValidate; TheRegExpression = new Regex (TheRegExTest); // test text with expression if (TheRegExpression.IsMatch(TheTextToValidate)) { return true ; } else { return false ; } }