Regular Expression (Regex)
A pattern language for finding and matching text.
What is Regular Expression (Regex)?
A regular expression (regex) is a sequence of characters that defines a search pattern used to find, match, validate, or replace text. It is used for tasks like validating email addresses, extracting data from logs, and search-and-replace in code editors. Regex syntax varies slightly between languages, and complex patterns are best checked against real sample input.