^start of line
Negative Lookahead(?!0*1\.0+$|\d{4}\.) 0*the literal 0 (4810 / 608 / 3016) , repeated any number of times
1the literal 1 (4910 / 618 / 3116)
\.the literal . (4610 / 568 / 2E16)
0+the literal 0 (4810 / 608 / 3016) , repeated at least once
$end of line
\d{4}a digit, repeated exactly 4 times
\.the literal . (4610 / 568 / 2E16)
0*the literal 0 (4810 / 608 / 3016) , repeated any number of times
1-9one character from 1 (4910) to 9 (5710)
\d*a digit, repeated any number of times
\.the literal . (4610 / 568 / 2E16)
\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