\ban ASCII word boundary
\d{4}a digit, repeated exactly 4 times
\s*any whitespace character, repeated any number of times
\d{4}a digit, repeated exactly 4 times
\s*any whitespace character, repeated any number of times
\d{4}a digit, repeated exactly 4 times
\s*any whitespace character, repeated any number of times
\d{4}a digit, repeated exactly 4 times
\ban ASCII word boundary
g modifier: global. Finds all matches instead of stopping after the first