Regular Expressions 101

1st Alternative(?:\d{4}-){3}\d{4}

Non-Capturing Group(?:\d{4}-){3}

{3}repeats the group contents below exactly 3 times:

\d{4}a Unicode decimal digit, repeated exactly 4 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{4}a Unicode decimal digit, repeated exactly 4 times

2nd Alternative\d{16}

\d{16}a Unicode decimal digit, repeated exactly 16 times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?:\d{4}-){3}\d{4}|\d{16}

New

5123-4567-8912-3456
61234-567-8912-3456
4123356789123456
5133-3367-8912-3456
6124-56378912-3456

5123-4567-8912-3456
61234-567-8912-3456
4123356789123456
5133-3367-8912-3456
6124-56378912-3456