$\ = "\n";
my $x='E:\\th\\foo';
print qr/^$x/; # start,"E",":",tab,"h",formfeed,"o","o"
print qr/^\Q$x/; # start,"E",":","\","t","h","\","f","o","o"
print qr/^\$x/; # start,"$","x"
print qr/^\\$x/; # start,"\","E",":",tab,"h",formfeed,"o","o"
print qr/E:\\th\\foo/; # "E",":","\","t","h","\","f","o","o"
print qr/E\:\\th\\foo/; # "E",":","\","t","h","\","f","o","o"
print qr/E\\:\\th\\foo/; # "E","\",":","\","t","h","\","f","o","o"
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