正则表达式查找方法

正则表达式查找方法

本文介绍了正则表达式查找方法的处理方法,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

这是我在给定字符串中查找ab模式的代码。

This is my code to find "ab" pattern in given string.

import java.util.regex.*;
public class RegExp
{
    public static void main(String[] args)
    {
        Pattern p = Pattern.compile("ab");
        Matcher m = p.matcher("ababbaba");
        while(m.find())
        {
            System.out.println(m.start());
        }
    }
}

但我无法了解的内部工作:find() start()

推荐答案

find 方法扫描输入序列,查找与模式匹配的下一个子序列并返回 boolean 表示失败成功。

The find method scans the input sequence looking for the next subsequence that matches the pattern and returns a boolean indicating the success of failure.

内部查找方法调用搜索方法(访问控制默认值),以便启动搜索以在给定范围内查找模式。在每次比赛时,界限将增加,直到找到所有比赛。

Internally find method calls the search method (access control default) so that initiates a search to find a Pattern within the given bounds. At each match the bound will be incremented until all the matches were found.

Matcher 类后面,它是一个状态机,它将保持匹配状态。

Behind the Matcher class it's a state machine that will hold the state of the match.

另一方面 start 方法将起始索引返回为 int 最新比赛捕获的子序列。

On the other hand start method returns the start index as int of the subsequence captured by the latest match.

如果你想真的更深入,我建议你去看看 Matcher class。

If you want really go deeper I suggest to review the source code of Matcher class.

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08-12 11:19