从字符串中提取所有(自然)数字的最有效方法

本文介绍了从字符串中提取所有(自然)数字的最有效方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

用户可能想根据需要分隔数字.

Users may want to delimit numbers as they want.

从字符串中提取所有(自然)数字最有效(或简单的标准函数)是什么?

What is the most efficient (or a simple standard function) to extract all the (natural) numbers from a string?

推荐答案

您可以使用正则表达式.我从 Sun的正则表达式匹配器教程修改了此示例:

You could use a regular expression. I modified this example from Sun's regex matcher tutorial:

import java.util.regex.Pattern; import java.util.regex.Matcher; public class Test { private static final String REGEX = "\\d+"; private static final String INPUT = "dog dog 1342 dog doggie 2321 dogg"; public static void main(String[] args) { Pattern p = Patternpile(REGEX); Matcher m = p.matcher(INPUT); // get a matcher object while(m.find()) { System.out.println("start(): "+m.start()); System.out.println("end(): "+m.end()); } } }

找到每个数字的开始和结束索引.正则表达式\d+允许以0开头的数字，但是如果需要，您可以轻松更改它.

It finds the start and end indexes of each number. Numbers starting with 0 are allowed with the regular expression \d+, but you could easily change that if you want to.