getLegalHeight static method
Implementation
static List<dynamic>? getLegalHeight(String? r){
if(r==null||!r.endsWith("\""))return null;
List<String>l=r.substring(0,r.length-1).split("'");
if(l.length!=2)return null;
int? ft=int.tryParse(l[0].isEmpty?'0':l[0]);
double? inch=double.tryParse(l[1].isEmpty?'0':l[1]);
if(ft==null||inch==null)return null;
return[ft,inch];
}