Negative Lookbehind(?<!test) testthe literal text test (case sensitive) hthe literal h (10410 / 1508 / 6816) (case sensitive)
\w+?any word character, repeated at least once
\.?optionally matches the literal . (4610 / 568 / 2E16)
\w+any word character, repeated at least once
@gmailthe literal text @gmail (case sensitive) \.the literal . (4610 / 568 / 2E16)
comthe literal text com (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