^start of line
\d+a Unicode decimal digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\s*a Unicode whitespace character, repeated any number of times
Group artist(?P<artist>.*?) .*?any Unicode character (except for line terminators), repeated any number of times
Non-Capturing Group(?:\bfeat\.?\s*(?P<feat>.*?))? ?repeats the group contents below at most once:
\ba Unicode word boundary
featthe literal text feat (case sensitive) \.?optionally matches the literal . (4610 / 568 / 2E16)
\s*a Unicode whitespace character, repeated any number of times
.*?any Unicode character (except for line terminators), repeated any number of times
\s+a Unicode whitespace character, repeated at least once
-the literal - (4510 / 558 / 2D16)
\s+a Unicode whitespace character, repeated at least once
.*?any Unicode character (except for line terminators), repeated any number of times
\s*a Unicode whitespace character, repeated any number of times
\(the literal ( (4010 / 508 / 2816)
Group beatmaker(?P<beatmaker>[^()]*) Negated Character Class[^()]* *matches any number of characters outside the set below:
(the literal ( (4010 / 508 / 2816)
)the literal ) (4110 / 518 / 2916)
\)the literal ) (4110 / 518 / 2916)
\s*a Unicode whitespace character, 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
u modifier: unicode. Treats the pattern and subject as UTF-16