\w+any word character, repeated at least once
\s+any whitespace character, repeated at least once
Negative Lookahead(?!3\b) 3the literal 3 (5110 / 638 / 3316)
\ban ASCII word boundary
\d+a digit, repeated at least once
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