Regular Expressions 101

\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.

Search reference

Regular Expression

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

New

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