When talking about validating input data, it is important to have an understanding of regular expressions, which is a powerful way to process text. It employs a pattern-matching technique to identify a pattern of text in input texts and validates it to the required format. For example, if our application wants to validate an email, regular expressions can be used to identify whether the email address provided is in a valid format. it checks for .com, @, and other patterns and returns if it matches a required pattern.

System.Text.RegularExpressions.Regex acts as a regular expression engine in .NET Framework. To use this engine, we need to pass two parameters, the first a pattern to match and the second text where this pattern matching happens.

The regex class comes up with four different methods – IsMatch, Match, Matches, and Replace. The IsMatch method...