alternative regex delimiter can prevent also strange syndrome..
perl -e "print $ARGV[0]=~s{\$}{\\\$}r" a$dollar
a\$dollar

or 

perl -e "print $ARGV[0]=~s{([\$\@\%])}{\\\1}gr" a$dollar@rray%%hashes
a\$dollar\@rray\%\%hashes

[download]


L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re^2: How to replace '$' in strings by Discipulus
in thread How to replace '$' in strings by ravi45722

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