String supplant(String o,map) {
     RegExp r = RegExp(r"{([^{}]+)}");
  	 return o.replaceAllMapped(r,(match){
       //print('matched;${match.group(1)}');
       return '${map[match.group(1)]}';
     });
}
main(){
  print(supplant('hello,{person},i will {do} u',{'person':'julie','do':['love','then','touch']}));
}