^start of line
Negative Lookahead(?!\d{4}-\d{10}) \d{4}a digit, repeated exactly 4 times
-the literal - (4510 / 558 / 2D16)
\d{10}a digit, repeated exactly 10 times
Negative Lookahead(?!\d{10}-\d{4}) \d{10}a digit, repeated exactly 10 times
-the literal - (4510 / 558 / 2D16)
\d{4}a digit, repeated exactly 4 times
\d{4}a digit, repeated exactly 4 times
-?optionally matches the literal - (4510 / 558 / 2D16)
\d{6}a digit, repeated exactly 6 times
-?optionally matches the literal - (4510 / 558 / 2D16)
\d{4}a digit, repeated exactly 4 times
$end of line
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string