For "begin end":
	begin end
For "begin en":
	no matches
For "begin nd":
	no matches
For "begin begin end end":
	begin begin end end
For "beginend":
	beginend
For "beginbeginbeginendendend":
	beginbeginbeginendend
For "begin begin end begin begin end begin end end end":
	begin begin end begin begin end begin end end
For "begin begin end begin  egin end begin end end end":
	begin begin end begin  egin end begin end end
For "begin end begin end":
	begin end*begin end