using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:\+1)?\(?([2-9]{0,1}[0-9]{2})\)?[. -]?([0-9]{3})[.-]?([0-9]{4})$";
string substitution = @"$1 $2 $3";
string input = @"312.876.9354
901-402-3541
(931)123-0953
(615) 561-0783
+17084223141";
RegexOptions options = RegexOptions.Multiline;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx