Question

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Java: how to check that a string is parsable to a double?

What is the best way to check a string for numeric characters in Java?

    try {
        NumberFormat defForm = NumberFormat.getInstance();            
        Number n = defForm.parse(s);      
        double d = n.doubleValue();
    } 
    catch (Exception ex) {
        // Do something here...    
    } 

Or is there a better way using REGEX?

I don’t want to strip the numbers.

Answer 1

using regex u can do it this way –

String s="aa56aa";
Pattern pattern = Pattern.compile("\\d");
Matcher matcher = pattern.matcher(s);

System.out.println(matcher.find());