Thanks for the detailed explanation. That was exactly what I was asking about: exact parts of both regexes which work incorrectly.

.\n was intended to match all characters, including newline character ( since with //m modifier '.' doesn't match newline ). But I see, that within square brackets the dot must be escaped. So, if all characters are expressed as \s\S, the regex now works: 
my $d = $s =~ s/[\s\S]*^$m *: (.*)$(?:[\s\S]*)/$1/rm;

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Thanks!

In reply to Re^2: Why multiline regex doesn't work? by nbd
in thread Why multiline regex doesn't work? by nbd

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