Regex Tester

JS fallback

Test .NET regular expressions with live matches and ready-to-use C# code

Pattern

valid

Hover a part to see what it matched · click it to change it

The .NET engine could not be loaded, so this preview is running in your browser's JavaScript engine and is only an approximation of .NET behaviour.

No ^ or $ anchors, so this matches anywhere inside the text. Add them to require the whole line to match.

Test text

3 matches

108 characters · edit freely, matches update as you type

Preview runs on the browser engine - an approximation · generated code targets .NET 7+

C# output

live

ClassMethod

using System.Text.RegularExpressions;

public partial class RegexPatterns
{
    [GeneratedRegex(@"(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})")]
    public static partial Regex MyRegex();
}

// Usage:
// foreach (Match match in RegexPatterns.MyRegex().Matches(input))
//     Console.WriteLine(match.Value);

2024-03-15 index 23 · length 10

year2024month03day1512024203315

Named groups come straight from (?<name>…) in the pattern; the numbered ones are the same groups counted left to right.

2024-04-02 index 59 · length 10

year2024month04day0212024204302

2024-05-30 index 83 · length 10

year2024month05day3012024205330