What is a regular expression?

A regular expression is a string that describes or matches a set of strings, according to certain syntax rules. Regular expressions are used by many text editors and utilities to search and manipulate bodies of text based on certain patterns. Many programming languages support regular expressions for string manipulation.

In the Microsoft .NET Framework, the Regex class contains several static methods that allow the use of a regular expression without explicitly creating a Regex object. Using a static method is equivalent to constructing a Regex object, using it once, and then destroying it.

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