fixed broken regexp in @open and @dig

execution_context.go

 func (c *ExecutionContext) openCmd(input string) {
 	// @open <in1;in2;in3;etc>=#<room>,<out1;out2;out3;etc>
 
-	r, _ := regexp.Compile(`^@open\pZ+([^=]*[^=\pZ]+)\pZ*=#([0-9]+)(?:\pZ*,\pZ*([^,]*[^,\pZ]+)\pZ*)?`)
+	r, _ := regexp.Compile(`^@open\pZ+([^=]*[^=\pZ]{1})\pZ*=#([0-9]+)(?:\pZ*,\pZ*([^,]*[^,\pZ]{1})\pZ*)?`)
 	params := r.FindStringSubmatch(input)
 
 	if params == nil {
 	// @dig <Room name>=<in1;in2;in3;etc>,<out1;out2;out3;etc>
 	//@dig foo bar  = <F>oo;foo;f,<B>ack;back;b
 
-	r, _ := regexp.Compile(`^@dig\pZ+([^=]*[^=\pZ]+)(\pZ*=\pZ*(?:([^,]*[^,\pZ]+)\pZ*)?(?:\pZ*,\pZ*([^,]*[^,\pZ]+)\pZ*)?)?`)
+	r, _ := regexp.Compile(`^@dig\pZ+([^=]*[^=\pZ]{1})(?:\pZ*=\pZ*(?:([^,]*[^,\pZ]{1})\pZ*)?(?:\pZ*,\pZ*([^,]*[^,\pZ]{1})\pZ*)?)?`)
 	params := r.FindStringSubmatch(input)
 	if params == nil {
 		return