mix
is not the English word mix, it's options of Regexp
.
See Regexp#to_s
:
Returns a string containing the regular expression and its options (using the (
?opts:source
) notation.
In your example, m
is for multiline mode, i
is for case insensitive, and x
is for extended mode. Options before the dash are on, those after are off (default). The question's example, ?-mix
, has all options off.
You can turn them on like:
puts /^a$/mix
# =>(?mix:^a$)
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