Build, test, and debug regular expressions
Validates phone numbers with an optional leading plus sign, an optional three-digit area code (optionally wrapped in parentheses), and two groups of four digits separated by an optional hyphen or space. It matches formats like (02) 1234 5678, +61 (03) 9876-5432, or 1234 5678, making it suitable for Australian-style or general phone input validation.