Regular Expression

A text pattern used to find, validate, or replace matching characters.

What is Regular Expression in C#?

Regular Expression — A text pattern used to find, validate, or replace matching characters.

using System.Text.RegularExpressions;

class OrderId
{
    bool IsValid(string value)
    {
        return Regex.IsMatch(value, @"^ORD-\d{4}quot;);
    }
}

Level: Journeyman · More C# terms at this level

Updated September 27, 2026