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c:\@Work\Perl\monks>perl -wMstrict -le
"for my $sr ('k\s', 'k\\s', 'k\\\\s', qr{ k \\ s }xms, qr{k\\s}xms) {
...
'remove back\slash' 'k\\s' -> 'remove bacxxlash'
'remove back\slash' (?^msx: k \\ s ) -> 'remove bacxxlash'
'remove back\slash' (?^msx:k\\s) -> 'remove bacxxlash'

c:\@Work\Perl\monks>perl -wMstrict -le
"my $inputtext = qq{a multi line\nstring and\nanother line\nthing here
+\n};
...
<<a multi xx-xx and
another xx-xx here
>>