Extract numbers from a string in java

Question

I want to extract numbers from a string like:

str="good_mor9ni13ng_23guys ";

The output should be an array [9,13,23]. How should I proceed?

score 7 · Accepted Answer · answered Jun 14 '15 at 09:42

7

You could do it like this:

List<String> matches = new ArrayList<String>();
Matcher m = Pattern.compile("[0-9]+").matcher("good_mor9ni13ng_23guys");
while (m.find()) {
    matches.add(m.group());
}

answered Jun 14 '15 at 09:42

Kai Sternad

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I would prefer `\d++`, but this will certainly work (+1). – Boris the Spider Jun 14 '15 at 10:01
@BoristheSpider yes \\d+ would be shorter. thanks – Kai Sternad Jun 14 '15 at 10:06
No, I meant `\d++` - the possessive quantifier. – Boris the Spider Jun 14 '15 at 10:10
Ah yes, thanks for pointing that out. – Kai Sternad Jun 14 '15 at 10:17

Extract numbers from a string in java

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