在文本中查找数字并将它们相加 [英] Finding numbers in a text and summing them

问题描述

在这里寻求正则表达式专家。我有一个包含数字的字符串，例如

Seeking regex experts here. I have a string that has numbers in it such as

abc 2 de fdfg 3 4 fdfdfv juk  @  dfdfgd 45

我需要找到这些字符串中的所有数字并加总。

I need to find all the numbers from such string and sum it up.

我的Java代码如下：

My Java code is as follows:

public static void main(String[] args) {

    String source = " abc 2 de fdfg 3 4 fdfdfv juk  @  dfdfgd 45";

    Pattern pattern = Pattern.compile("[\\w*\\W*(\\d*)]+");
    Matcher matcher = pattern.matcher(source);

    if (matcher.matches()) {
        System.out.println("Matched");

            // For loop is not executed since groupCount is zero
            for (int i=0; i<matcher.groupCount(); i++) {
                String group = matcher.group(i);
                System.out.println(group);
            }
    } else {
        System.out.println("Didn't match");
    }
}

所以matcher.matches（）返回true，因此我可以看到匹配打印。然而，当我试图获得群组时，期待数字，没有任何内容被打印出来。

So matcher.matches() returns true, and therefore I can see that "Matched" getting printed. However, when I try to get the groups, expecting numbers, nothing gets printed.

有人可以指出我的正则表达式和分组部分有什么问题吗？

Can someone please point to me what is wrong with my regex and grouping part?

推荐答案

只需在组中提取数字，不用担心空格。

Just extract the digits out in groups and not worry about the white spaces.

public static void main(String[] args) throws Exception {
    String source = " abc 2 de fdfg 3 4 fdfdfv juk  @  dfdfgd 45";

    // "\\d+" will get all of the digits in the String
    Pattern pattern = Pattern.compile("\\d+");
    Matcher matcher = pattern.matcher(source);

    int sum = 0;
    // Convert each find to an Integer and accumulate the total
    while (matcher.find()) {
        sum += Integer.parseInt(matcher.group());
    }
    System.out.println("Sum: " + sum);
}

结果：

总和：54

Sum: 54

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