Regular Expressions 101

Explanation

Pro

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

Negative Lookahead(?! {2,})

{2,}the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least 2 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

\d{4}(?! {2,})

New

1234 5678 9101 1234  
2999 5178 9101 2234  
9999 5628 9201 1232  
8888 3678 9101 1232

1234 5678 9101 1234  
2999 5178 9101 2234  
9999 5628 9201 1232  
8888 3678 9101 1232