\ba Unicode word boundary
SMCthe literal text SMC (case sensitive) \sa Unicode whitespace character
\d{1,3}a Unicode decimal digit, repeated between 1 and 3 times
\.the literal . (4610 / 568 / 2E16)
\d{1,3}a Unicode decimal digit, repeated between 1 and 3 times
Negative Lookahead(?!\.?\d) \.?optionally matches the literal . (4610 / 568 / 2E16)
\da Unicode decimal digit
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