using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^[^]*?\((\d{3})\)\s*(\d+)-(\d+)\s*\(Main\)[^]*";
string substitution = @"$1-$2-$3";
string input = @"
(555) 555-5555 (Main)
,
(777) 777-777 (Domestic Fax)
";
Regex regex = new Regex(pattern);
string result = regex.Replace(input, substitution, 1);
}
}
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