Regular Expression (Regex)

A regular expression uses characters and symbols to describe patterns within text. For example, a regex can identify email addresses, phone numbers, URLs, keywords, or specific text formats. Regex can be used in programming languages, search tools, and data- processing systems.

Regex provides a flexible way to detect and process structured or predictable text patterns. In AI and security systems, it can support input validation, sensitive-data detection, content filtering, and rule-based scanning alongside other detection techniques.