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  1. or download this
    say "foo: bar" =~ s/^ ( \w+: \s* ) bar /${1}baz/xr;
  2. or download this
    say "foo: bar" =~ s/^ \w+: \s* \K bar /baz/r;
  3. or download this
    say "a:b:c:d" =~ s/ :\K [^:]+ (?=:) / uc($&) /xegr;
  4. or download this
    say "a:b:c:d" =~ s/ : [^:]+ (?=:) / ":" . uc($&) /xegr;
  5. or download this
    say "foo: bar" =~ s/ (?<= ^ \w+: \s* ) bar /baz/xr;
  6. or download this
    say "foo: bar" =~ s/^ \w+: \s* \K bar /baz/r;