validate

Validates an Indian mobile number.

Input normalisation applied before validation (in order):

1. Trim leading/trailing whitespace

2. Strip +91 prefix (if present)

3. Strip a single leading 0 (if present after step 2)

4. Strip all remaining spaces and hyphens

After normalisation, checks are applied in this order — first failing check wins:

• InvalidReason.EMPTY if the result is blank

• InvalidReason.WRONG_LENGTH if digit count is not 10

• InvalidReason.INVALID_FORMAT if any non-digit character remains

• InvalidReason.INVALID_PREFIX if the first digit is not 6, 7, 8, or 9

Edge cases:

• "+910876543210" → strip +91 → "0876543210" → strip leading 0 → "876543210" (9 digits) → InvalidReason.WRONG_LENGTH

• "00876543210" → no +91 prefix → strip one leading 0 → "0876543210" (10 digits, starts with 0) → InvalidReason.INVALID_PREFIX

• "0876543210" → strip leading 0 → "876543210" (9 digits) → InvalidReason.WRONG_LENGTH

Parameters

Samples

check(Mobile.validate("9876543210") == ValidationResult.Valid)
check(Mobile.validate("+91 98765 43210") == ValidationResult.Valid)