Question

grep m{^[/!:]}, @imports

Anyone knows what m means here?

I don’t find any reference .

Answer 1

mress-2:10005 Z$ perldoc -f m
       m//     The match operator.  See "Regexp Quote-Like Operators" in
               perlop.

Basically, if you need to use a / inside a pattern, it’s easier to switch the pattern delimiters; but then you need to tell Perl you’re doing that, so you start the pattern with m. /.../ can also be written m/.../. Using m also means you can use balanced pairs {...}, (...), [...], <...> (but not brackets from outside ASCII such as guillemots or the math brackets in Unicode).