You may use semicolons as sepators instead of ampersands, according to CGI.pm documentation :
-newstyle_urls
Separate the name=value pairs in CGI parameter query strings with semicolons rather than ampersands. For example: 
       ?name=fred;age=24;favorite_color=3

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In reply to Re: using CGI with different delimiter than '&' by wazoox
in thread using CGI with different delimiter than '&' by Anonymous Monk

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