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in reply to Re^4: Executing CGI/web form directives in regex substitution without pages of code
in thread Executing CGI/web form directives in regex substitution without pages of code

The  /r modifier for  s/// substitution was added with Perl version 5.14 (see Regexp Quote-Like Operators in perlop). What version of Perl are you using?

Give a man a fish:  <%-{-{-{-<

In Section Seekers of Perl Wisdom