^start of line
Non-Capturing Group(?:--[A-Z]{2}|[A-Z]{2}(?:--|[A-Z]{2})) 1st Alternative--[A-Z]{2} {2}matches exactly 2 characters from the set below:
A-Zone character from A (6510) to Z (9010) (case insensitive)
2nd Alternative[A-Z]{2}(?:--|[A-Z]{2}) {2}matches exactly 2 characters from the set below:
A-Zone character from A (6510) to Z (9010) (case insensitive)
Non-Capturing Group(?:--|[A-Z]{2}) {2}matches exactly 2 characters from the set below:
A-Zone character from A (6510) to Z (9010) (case insensitive)
\d{2}a digit, repeated exactly 2 times
/the literal / (4710 / 578 / 2F16)
Character Class[0-9A-F]{8} {8}matches exactly 8 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
A-Fone character from A (6510) to F (7010) (case insensitive)
Non-Capturing Group(?:-[0-9A-F]{4}){3} {3}repeats the group contents below exactly 3 times:
-the literal - (4510 / 558 / 2D16)
Character Class[0-9A-F]{4} {4}matches exactly 4 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
A-Fone character from A (6510) to F (7010) (case insensitive)
-the literal - (4510 / 558 / 2D16)
Character Class[0-9A-F]{12} {12}matches exactly 12 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
A-Fone character from A (6510) to F (7010) (case insensitive)
\.the literal . (4610 / 568 / 2E16)
pngthe literal text png (case insensitive) $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
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters