如何从字符串中提取数字并获取整数数组? [英] How to extract numbers from a string and get an array of ints?

问题描述

我有一个字符串变量(基本上是一个带有未指定数字数量的英文句子)，我想将所有数字提取到一个整数数组中.我想知道是否有使用正则表达式的快速解决方案?

I have a String variable (basically an English sentence with an unspecified number of numbers) and I'd like to extract all the numbers into an array of integers. I was wondering whether there was a quick solution with regular expressions?

我使用了 Sean 的解决方案并稍作更改:

I used Sean's solution and changed it slightly:

LinkedList<String> numbers = new LinkedList<String>();

Pattern p = Pattern.compile("\\d+");
Matcher m = p.matcher(line); 
while (m.find()) {
   numbers.add(m.group());
}

推荐答案

Pattern p = Pattern.compile("-?\\d+");
Matcher m = p.matcher("There are more than -2 and less than 12 numbers here");
while (m.find()) {
  System.out.println(m.group());
}

... 打印 -2 和 12.

... prints -2 and 12.

-?匹配前导负号 - 可选.\d 匹配一个数字，但我们需要在 Java 字符串中将 \ 写为 \\ .所以，\d+ 匹配 1 个或多个数字.

-? matches a leading negative sign -- optionally. \d matches a digit, and we need to write \ as \\ in a Java String though. So, \d+ matches 1 or more digits.

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