Regex or Exception Handling?

Question

Which one of the following is a better practice to check if a string is float?

try{
 Double.parseDouble(strVal);
}catch(NumberFormatException e){
 //My Logic         


        

Answer 1

May be you can also try this way.But this is generic for a string containing valid number.

public static boolean isNumeric(String str) 
{ 
    str = "2.3452342323423424E8";
 //   str = "21414124.12412412412412";
 //   str = "123123";
    NumberFormat formatter = NumberFormat.getInstance(); 
    ParsePosition pos = new ParsePosition(0); 
    formatter.parse(str, pos); 
    return  str.length() == pos.getIndex();  
}