I guess here you miss the possibility to have modifiers within the regular expression? A postponed /i modifier can also be written as (?i) within the regex - and in this fashion used in qr//.

In reply to Re^3: Executing CGI/web form directives in regex substitution without pages of code by haj
in thread Executing CGI/web form directives in regex substitution without pages of code by Polyglot

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