in reply to Re^2: print join n times on a line
in thread print join n times on a line

Is s[xx][yy] equivalent to s/xx/yy/?
Yes. From perlop:
Any non-whitespace delimiter may replace the slashes.
Also, it does not work as written. I am using Perl 5.8.8.
The \K requires perl 5.10 or higher (perl5100delta).