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in reply to Define regex substitution $1,$2,... from a string

If your parameter is always an URI, you could use the CPAN Modules URI and File::Basename.
use File::Basename; use URI::Split qw(uri_split uri_join); my @uri = uri_split('https://www.domain.com/aaa/bbb/file.zip'); $uri[3] = 'file='.basename($uri[2]); $uri[2] = 'file_publish'; my $uri = uri_join(@uri); print $uri."\n";