^start of line
dc-cn-the literal text dc-cn- (case sensitive) \d{2}a digit, repeated exactly 2 times
.*?any character (except for line terminators), repeated any number of times
-?optionally matches the literal - (4510 / 558 / 2D16)
?repeats the group contents below at most once:
{2}matches exactly 2 characters from the set below:
a-zone character from a (9710) to z (12210) (case sensitive)
vthe literal v (11810 / 1668 / 7616) (case sensitive)
\d+a digit, repeated at least once
-the literal - (4510 / 558 / 2D16)
\d+a digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
pdfthe literal text pdf (case sensitive) $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