Extract Integer Part in String

Question

What is the best way to extract the integer part of a string like

Hello123 

How do you get the 123 part. You can sort of hack it using Java's Scanner, is there a better way?

Answer 1

As explained before, try using Regular Expressions. This should help out:

String value = "Hello123"; String intValue = value.replaceAll("[^0-9]", ""); // returns 123 

And then you just convert that to an int (or Integer) from there.

Answer 2

I believe you can do something like:

Scanner in = new Scanner("Hello123").useDelimiter("[^0-9]+"); int integer = in.nextInt(); 

EDIT: Added useDelimiter suggestion by Carlos