Regex Tester & Validator

Validates Vietnamese phone numbers in local format (leading 0) or international format (leading 84 country code). It verifies the 3-digit prefix against known Vietnamese landline area codes (20x-29x) and mobile operator prefixes (32-39, 55/56/58/59, 70/76-79, 80-86/88/89, 90-94/96-99), followed by exactly 7 subscriber digits. Ideal for validating 10 or 11 digit Vietnam phone inputs in forms and contact data.