Phone Match

CSharp · Console

/Program.cs

using System;
using System.Linq;
using System.Text.RegularExpressions;
					
public class Program {
  private static string MakeRegex(params string[] patterns) {
    static string SinglePattern(string pattern) => "(?:" + string.Concat(Regex
      .Split(pattern, "(x+)")
      .Select(item => item.StartsWith('x')
         ? $"[0-9]{{{item.Length}}}"
         : string.Concat(item.Select(c => Regex.Escape(c.ToString()))))) + ")";

     return string.Join("|", patterns.Select(pattern => SinglePattern(pattern))); 
  }
	
  public static void Main()	{
    string phonePattern = MakeRegex(
      "+xxx xxx xxx xxx",
      "(xxx) xxx xxx xxx",
      "xxx xxx xxx",
      "xxxxxxxxx",
      "+xxxxxxxxxxxx"
    );

    string[] tests = new string[] {
      //TODO: Add more tests here
      "+123 456 789 777",
      "(123) 456 789 444",
      "123 456 789",
      "123456789",
      "+123456789567",

      "12345678",
      "1234567899",
      "1234 56 789",
    };

    string report = string.Join(Environment.NewLine, tests
      .Select(test => $"{test,20} : {(Regex.IsMatch(test, phonePattern) ? "Matched" : "No")}"));

    Console.WriteLine(report);
	Console.WriteLine();
	Console.WriteLine("Parsed Demo");
	Console.WriteLine();   
	  
	string text = 
      @"This is the sample text with phones: +420 000 111 222,
      and (420) 555 789 567 or 123456789 and some numbers 123 or 78.";

    var parsed = Regex
      .Matches(text, phonePattern)
      .Cast<Match>()
      .Select(m => string.Concat(m.Value.Where(c => c >= '0' && c <= '9')))
      .Select(phone => new {
        country = phone.Length > 9 ? phone.Substring(0, 3) : "",
        number =  phone.Length > 9 ? phone.Substring(3) : phone
      });   
	 
    Console.WriteLine(string.Join(Environment.NewLine, parsed));	  
  }
}