In unix, creating a string in double quotes will cause interpolation of whatever the shell thinks are shell variables, e.g.
perl -we "$b=14; print $b"
syntax error at -e line 1, near "="
Execution of -e aborted due to compilation errors.
or:
echo hello world
perl -we "if($_=~/World/){print 111}"
Unquoted string "world" may clash with future reserved word at -e line
+ 1.
111
Although your posted one-liner causes no complains in my linux/bash, maybe is not working as expected since $_ has a special meaning in bash (and possibly other shells): it is the last parameter of the last command (more special variables here: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_05_02)
So, Unquoted string "world" is caused by the interpolation of $_ by bash shell
bw, bliako
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