A regular expression (regex or regexp) is a sequence of characters that forms a search pattern. It is used for string matching and manipulation, allowing you to search, match, and replace text based on specific patterns. Regular expressions are commonly used in programming and text processing to validate input, search for specific strings, and perform complex string operations.
For example, a regex can be used to check if a string contains a specific format, such as an email address or a phone number. Regular expressions can be implemented in various programming languages, each with its own syntax and features.
