.*?any Unicode character (except for line terminators), repeated any number of times
\ba Unicode word boundary
\d{2}a Unicode decimal digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a Unicode decimal digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\d{4}a Unicode decimal digit, repeated exactly 4 times
\ba Unicode word boundary