It seems to me from the OP's description that it will always end in a semi-colon. If not, add it: 
my $src_string = 'aaa:bbb:ccc:ddd:eee';
my @results = "$src_string:" =~ /([^:]*):/g;

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In reply to Re^3: Matching and making accesible an arbitrary number of subpatterns w/a regex? by ikegami
in thread Matching and making accesible an arbitrary number of subpatterns w/a regex? by rojam74

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