\ban ASCII word boundary
\d{3}a digit, repeated exactly 3 times
\)the literal ) (4110 / 518 / 2916)
Positive Lookahead(?=.{3,5}\W\b) .{3,5}any character (except for line terminators), repeated between 3 and 5 times
\Wany non-word character
\ban ASCII word boundary
{0,2}the literal (3210 / 408 / 2016) , repeated between 0 and 2 times
\d{3}a digit, repeated exactly 3 times