\ban ASCII word boundary
Positive Lookahead(?=\w{8}\b) \w{8}any word character, repeated exactly 8 times
\ban ASCII word boundary
Positive Lookahead(?=\w*a) \w*any word character, repeated any number of times
athe literal a (9710 / 1418 / 6116) (case sensitive)
\w*any word character, repeated any number of times
ethe literal e (10110 / 1458 / 6516) (case sensitive)
\w*any word character, repeated any number of times
\ban ASCII word boundary
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