^start of line
BLTYthe literal text BLTY (case sensitive) Non-Capturing Group(?::\w+){3} {3}repeats the group contents below exactly 3 times:
:the literal : (5810 / 728 / 3A16)
\w+any word character, repeated at least once
Non-Capturing Group(?:\.\w+){3} {3}repeats the group contents below exactly 3 times:
\.the literal . (4610 / 568 / 2E16)
\w+any word character, repeated at least once
/the literal / (4710 / 578 / 2F16)
.*any character (except for line terminators), repeated any number of times
\(the literal ( (4010 / 508 / 2816)
\d+a digit, repeated at least once
\)the literal ) (4110 / 518 / 2916)
$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