Is s[xx][yy] equivalent to s/xx/yy/?

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Yes. From perlop: 
Any non-whitespace delimiter may replace the slashes.

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Also, it does not work as written. I am using Perl 5.8.8.
The \K requires perl 5.10 or higher (perl5100delta).

In reply to Re^3: print join n times on a line by toolic
in thread print join n times on a line by austin43

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