Non-Capturing Group(?:\w+ ){0,5} {0,5}repeats the group contents below between 0 and 5 times:
\w+any word character, repeated at least once
the literal (3210 / 408 / 2016)
\w+any word character, repeated at least once
@the literal @ (6410 / 1008 / 4016)
\w+any word character, repeated at least once
\.the literal . (4610 / 568 / 2E16)
Non-Capturing Group(?:com|gov|edu|org) comthe literal text com (case sensitive) govthe literal text gov (case sensitive) eduthe literal text edu (case sensitive) orgthe literal text org (case sensitive) 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