^start of line
\w+any word character, repeated at least once
+repeats the group contents below at least once:
?repeats the group contents below at most once:
\.the literal . (4610 / 568 / 2E16)
\w+any word character, repeated at least once
@the literal @ (6410 / 1008 / 4016)
\w+any word character, repeated at least once
.?optionally matches any character (except for line terminators)
\w+any word character, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\w+any word character, repeated at least once
$end of line
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