Test, validate and match regular expressions
Matches loosely-formatted phone numbers with an optional leading '+' or '(' prefix, a 1-4 digit country/area code, and up to 11 subsequent digits where each digit may be separated by optional delimiters (dots, hyphens, spaces, or parentheses). Useful for extracting phone numbers in varied formats like +1 (555) 123-4567 or 555.123.4567 from text, with the global flag finding all occurrences.