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.
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从字符串中提取所有(自然)数字的最有效方法
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