Web Reference: Learn Regular Expressions with simple, interactive exercises. Regular expressions are extremely useful in extracting information from text such as code, log files, spreadsheets, or even documents. Basically, a regular expression is a pattern describing a certain amount of text. Their name comes from the mathematical theory on which they are based. But we will not dig into that. You will usually find the name abbreviated to "regex" or "regexp". This tutorial uses "regex", because it is easy to pronounce the plural "regexes". On this website, ... Dec 22, 2025 · A regular expression (regex) is a sequence of characters that defines a search pattern. It is mainly used for pattern matching in strings, such as finding, replacing, or validating text. Regex is supported in almost every programming language, including Python, Java, C++ and JavaScript.
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