// Copyright 2009 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file.packagemainimport("os";"regexp";)funcmain(){str:="a*b*c*";ifsys.argc()>1{str=sys.argv(1);}re,err:=regexp.Compile(str);iferr!=nil{print("error: ",err.String(),"\n");sys.exit(1);}}