Best way to get integer part of the string "600sp"?

Question

I have a string, say "600sp" from which I wish to obtain the integer part (600).

If I do Integer.valueOf("600sp") I get an exception due to the non-numeric value "s" which is encountered in the string.

What is the fastest cleanest way to grab the integer part?

Thanks!

Answer 1

If your string format is always going to be number followed by some characters, then try this

mystr.split("[a-z]")[0]

Answer 2

Depending on the constraints of your input, you may be best off with regex.

    Pattern p = Pattern.compile("(\\d+)");
    Matcher m = p.matcher("600sp");
    Integer j = null;
    if (m.find()) {
        j = Integer.valueOf(m.group(1));
    }

This regular expression translates as 'give me the set of contiguous digits at the beginning of the string where there is at least 1 digit'. If you have other constraints like parsing real numbers as opposed to integers, then you need to modify the code.