Group 2((?>\s|\b)\w{3}\s) \sany whitespace character
\w{3}any word character, repeated exactly 3 times
\sany whitespace character
.+any character (except for line terminators), repeated at least once
\s+any whitespace character, repeated at least once
\sany whitespace character
\d+a digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\sany whitespace character
.*any character (except for line terminators), repeated any number of times
\s+any whitespace character, repeated at least once
\sany whitespace character
\d{1}a digit, repeated exactly 1 time
\sany whitespace character
.*any character (except for line terminators), repeated any number of times