Phone number in international form: a + sign, a country code, then groups of digits. The area code may be parenthesised, and the parentheses are paired so a number written inside brackets does not swallow one. Deliberately loose about grouping, so it overlaps with every national phone pattern: do not put both in the same detector.
Label: PHONE_INTERNATIONAL
(?<![\w+])\+\d{1,3}[\s.-]?(?:\(\d{1,4}\)|\d{1,4})(?:[\s.-]?\d{1,4}){1,4}(?!\d)Call +44 20 7946 0958 during office hours. → +44 20 7946 0958Fax: +49 (30) 1234567 → +49 (30) 1234567Mobile +33 6 39 98 01 → +33 6 39 98 01Call 44 20 7946 0958 nowversion C+42 1234Tags: international, contact