Regex

Regular expressions (regex) are sequences of characters that define search patterns. Regex is used for text matching, validation, and manipulation. In cybersecurity, regex is essential for log analysis, pattern detection in network traffic, input validation, and threat hunting. Common uses include validating email addresses, extracting IP addresses from logs, and identifying malicious patterns. While powerful, regex can introduce security issues like ReDoS (Regular Expression Denial of Service) if poorly written.