Regex to match continuous pattern of integer then space

Question

I\'m asking the user for input through the Scanner in Java, and now I want to parse out their selections using a regular expression. In essence, I show them an enu

Answer 1

If you want to ensure that your string contains only numbers and spaces (with a variable number of spaces and trailing/leading spaces allowed) and extract number at the same time, you can use the \G anchor to find consecutive matches.

String source = "1 3 5 8";

List result = new ArrayList();
Pattern p = Pattern.compile("\\G *(\\d++) *(?=[\\d ]*$)");
Matcher m = p.matcher(source);

while (m.find()) {
    result.add(m.group(1));
}
for (int i=0;i

Note: at the begining of a global search, \G matches the start of the string.