^start of line
Negative Lookahead(?!-|_|\d) -the literal - (4510 / 558 / 2D16)
_the literal _ (9510 / 1378 / 5F16)
\da Unicode decimal digit
\w+a Unicode word character, repeated at least once
Negative Lookbehind(?<!\db) \da Unicode decimal digit
bthe literal b (9810 / 1428 / 6216) (case sensitive)
-vthe literal text -v (case sensitive) \d+a Unicode decimal digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\d+a Unicode decimal digit, repeated at least once
-the literal - (4510 / 558 / 2D16)
\w+a Unicode word character, repeated at least once
-vthe literal text -v (case sensitive) \d+a Unicode decimal digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\d+a Unicode decimal digit, repeated at least once
Group 1(-\d+b-\w+|-\d+x\d+b-\w+-*|-\d+b-\w+-.*|-\w+-\d+b|-\w+-\w+-.*) -the literal - (4510 / 558 / 2D16)
\d+a Unicode decimal digit, repeated at least once
b-the literal text b- (case sensitive) \w+a Unicode word character, repeated at least once
2nd Alternative-\d+x\d+b-\w+-* -the literal - (4510 / 558 / 2D16)
\d+a Unicode decimal digit, repeated at least once
xthe literal x (12010 / 1708 / 7816) (case sensitive)
\d+a Unicode decimal digit, repeated at least once
b-the literal text b- (case sensitive) \w+a Unicode word character, repeated at least once
-*the literal - (4510 / 558 / 2D16) , repeated any number of times
3rd Alternative-\d+b-\w+-.* -the literal - (4510 / 558 / 2D16)
\d+a Unicode decimal digit, repeated at least once
b-the literal text b- (case sensitive) \w+a Unicode word character, repeated at least once
-the literal - (4510 / 558 / 2D16)
.*any Unicode character (except for line terminators), repeated any number of times
-the literal - (4510 / 558 / 2D16)
\w+a Unicode word character, repeated at least once
-the literal - (4510 / 558 / 2D16)
\d+a Unicode decimal digit, repeated at least once
bthe literal b (9810 / 1428 / 6216) (case sensitive)
5th Alternative-\w+-\w+-.* -the literal - (4510 / 558 / 2D16)
\w+a Unicode word character, repeated at least once
-the literal - (4510 / 558 / 2D16)
\w+a Unicode word character, repeated at least once
-the literal - (4510 / 558 / 2D16)
.*any Unicode character (except for line terminators), repeated any number of times
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