Regex Tester & Validator

This regex strictly validates international phone numbers formatted according to the E.164 ITU telephony standard. It requires a leading plus sign followed by 9 to 15 digits, ensuring the first digit is non-zero. Additionally, it supports an optional extension component formatted as ";ext=" followed by 3 to 6 digits. It is ideal for validating user input in contact forms or CRM systems where precise global phone number data integrity is crucial.