Pattern matching in C# with Regex

A regular expression is a pattern that could be matched against an input text. A pattern consists of one or more character literals, operators, or constructs.

Let us see an example to display the words starting with the letter ‘M’ using Regex.

Example

 Live Demo

using System;
using System.Text.RegularExpressions;

namespace Demo {
   class Program {
      private static void showMatch(string text, string expr) {
         Console.WriteLine("The Expression: " + expr);
         MatchCollection mc = Regex.Matches(text, expr);
         foreach (Match m in mc) {
            Console.WriteLine(m);
         }
      }

      static void Main(string[] args) {
         string str = "Mandatory requirements for a Cricket Match Event!";

         Console.WriteLine("Matching words that start with 'M': ");
         showMatch(str, @"\bM\S*");
         Console.ReadKey();
      }
   }
}

Output

Matching words that start with 'M':
The Expression: \bM\S*
Mandatory
Match

Above, I have the string.

string str = "Mandatory requirements for a Cricket Match Event!";

To get all the words that begin with ‘M’, I have used the following pattern −

@"\bM\S*