Csharp/CSharp Tutorial/Regular Expression/Regex Phone number

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Match a phone number

<source lang="csharp">using System; using System.Text.RegularExpressions;

 class Class1
 {
   [STAThread]
   static void Main(string[] args)
   {
       Regex phoneExp = new Regex( @"^\(\d{3}\)\s\d{3}-\d{4}$" );
         string input;
           Console.Write( "Enter a phone number: " );
           input = Console.ReadLine();
           
           while( phoneExp.Match( input ).Success == false )
           {
               Console.WriteLine( "Invalid input. Try again." );
               Console.Write( "Enter a phone number: " );
               input = Console.ReadLine();
           }
           Console.WriteLine( "Validated!" );
   }
 }</source>

Regular Expression: phone number

<source lang="csharp">using System; using System.Text.RegularExpressions; class MainClass {

 public static void Main()
 {
   string text = "(800) 888-1211\n" +
     "(212) 555-1212\n" +
     "(506) 777-1213\n" +
     "(650) 222-1214\n" +
     "(888) 111-1215\n";
   string areaCodeRegExp = @"(?<areaCodeGroup>\(\d\d\d\))";
   string phoneRegExp = @"(?<phoneGroup>\d\d\d\-\d\d\d\d)";
   MatchCollection myMatchCollection = Regex.Matches(text, areaCodeRegExp + " " + phoneRegExp);
   foreach (Match myMatch in myMatchCollection)
   {
     Console.WriteLine("Area code = " + myMatch.Groups["areaCodeGroup"]);
     Console.WriteLine("Phone = " + myMatch.Groups["phoneGroup"]);
     foreach (Group myGroup in myMatch.Groups)
       foreach (Capture myCapture in myGroup.Captures)
         Console.WriteLine("myCapture.Value = " + myCapture.Value);
   }
 }

}</source>

Area code = (800)
Phone = 888-1211
myCapture.Value = (800) 888-1211
myCapture.Value = (800)
myCapture.Value = 888-1211
Area code = (212)
Phone = 555-1212
myCapture.Value = (212) 555-1212
myCapture.Value = (212)
myCapture.Value = 555-1212
Area code = (506)
Phone = 777-1213
myCapture.Value = (506) 777-1213
myCapture.Value = (506)
myCapture.Value = 777-1213
Area code = (650)
Phone = 222-1214
myCapture.Value = (650) 222-1214
myCapture.Value = (650)
myCapture.Value = 222-1214
Area code = (888)
Phone = 111-1215
myCapture.Value = (888) 111-1215
myCapture.Value = (888)
myCapture.Value = 111-1215