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$ perl -le 'print join "\n", map {s/\\://g;$_} "aa:b\\:b\\::\\:c\\:\\: +c"=~m!(?>\\.|[^:])+!gs' aa bb cc
$ perl -le 'print join "\n", map {s/\\://g;$_} "111111111:22222\\:2222 +:333333333:4444444"=~m!(?>\\.|[^:])+!gs' 111111111 222222222 333333333 4444444