^start of line
.*any character (except for line terminators), repeated any number of times
%the literal % (3710 / 458 / 2516)
Negative Lookahead(?!([.]?[0-9]+)?[a-zA-Z]) ?repeats the group contents below at most once:
?matches at most one character from the set below:
.the literal . (4610 / 568 / 2E16)
+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
a-zone character from a (9710) to z (12210) (case sensitive)
A-Zone character from A (6510) to Z (9010) (case sensitive)
.*any character (except for line terminators), repeated any number of 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