我编写了一个程序,要求用户提供目标字符串和要在其中搜索的模式。它旨在查找匹配模式的位置以及它在目标字符串中存在多少次。但是,即使目标字符串中存在该模式,也始终显示未找到任何模式。我已经为此写了一个函数searchPattern()
。
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main
{
private static Scanner sc = new Scanner(System.in);
public static void main(String[] args)
{
String pattern,target;
System.out.println("Enter Target String: ");
pattern = sc.nextLine();
System.out.println("Enter pattern to be searched: ");
target = sc.nextLine();
searchPattern(pattern,target);
}
public static void searchPattern(String pattern,String target)
{
Pattern p = Pattern.compile(pattern);
Matcher m = p.matcher(target);
int count = 0;
//if(!m.find())return;
while (m.find())
{
count ++;
System.out.println(m.start() + "--" + m.end() + "--" + m.group());
}
if (count == 0)
System.out.println("Your pattern was not found in the target string");
else
System.out.println("Total occurrences of 'ab' are" + count);
}
}
它提供以下输出:
Enter Target String:
ababbab
Enter pattern to be searched:
ab
Your pattern was not found in the target string
即使目标字符串中存在'ab',该代码为何也不起作用
您将目标和模式存储在错误的变量中