using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\(?\b([0-9]{3})\)?([0-9]{3})?([0-9]{4})\b";
string input = @"1234567890
99999999999999
hello world1234567890
123-456-7890
0123456789
123.456.7890
123 456 7890
8054448445
3104448445
8187558094
310
";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
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