^start of string
\S+any non-whitespace character, repeated at least once
=registrationthe literal text =registration (case insensitive) \.the literal . (4610 / 568 / 2E16)
activatethe literal text activate (case insensitive) \&the literal & (3810 / 468 / 2616)
.*any character (except for line terminators), repeated any number of times
g modifier: global. Finds all matches instead of stopping after the first
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters