16.16. Regular Expressions and Class RegEx
Regular expressions are specially formatted Strings used to find (and possibly replace) patterns in text. They can be useful during information validation, to ensure that data is in a particular format. For example, a United States ZIP code must consist of five digits, and a last name must start with a capital letter. Compilers use regular expressions to validate the syntax of programs. If the program code does not match the regular expression, the compiler indicates that there is a syntax error.
The .NET Framework provides several classes to help developers recognize and manipulate regular expressions. Class Regex (of the System.Text.RegularExpressions namespace) represents an immutable regular expression. ...
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