Regular Expressions - RegEx

Owned by Roger Cruz

Jan 04, 2021

1 min read

1 Intro
2 Define The Pattern To Match
3 Execute Match

Intro

My notes on C#'s support for regular expressions via the System.Text.RegularExpressions namespace.

Define The Pattern To Match

You first need to define the RegEx pattern to be used. You can define the regex pattern as a string.

string pattern = @"^dog.*";
Regex rx = new Regex(pattern, RegexOptions.IgnoreCase);

Execute Match

DotNetFiddle: https://dotnetfiddle.net/OqEBzt

string input1 = "dog runs around\ndog2 runs around too.";
Match match = rx.Match(input1);
while (match.Success)
{
    Console.WriteLine("'{0}' found at position {1}.",  match.Value, match.Index);
    match = match.NextMatch();
}