multiple versions could occur and should also be highlighted

plugins/rvm/rvm.plugin.zsh

@@ -37,7 +37,7 @@ function gems {
 	local current_gemset=`rvm-prompt g`
 
 	gem list $@ | sed \
-		-Ee "s/\([0-9\.]+( .+)?\)/$fg[blue]&$reset_color/g" \
+		-Ee "s/\([0-9, \.]+( .+)?\)/$fg[blue]&$reset_color/g" \
 		-Ee "s|$(echo $rvm_path)|$fg[magenta]\$rvm_path$reset_color|g" \
 		-Ee "s/$current_ruby@global/$fg[yellow]&$reset_color/g" \
 		-Ee "s/$current_ruby$current_gemset$/$fg[green]&$reset_color/g"