Question

我正在使用正则表达式从网页中提取黄金报价。我正在将其解析为字符串，然后使用正则表达式来提取引号。

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HelloWorld{

 public static void main(String []args){
     String str = "----------------------------------------------------------------------"
                + "Metals          Bid        Ask           Change        Low       High "
                + "----------------------------------------------------------------------"
                + "Gold         1176.40     1177.40     -8.60  -0.73%    1171.90  1183.90";

    Pattern pattern = Pattern.compile("Gold(\\s{9})(\\d{4}).(\\d{2})");
    Matcher matcher = pattern.matcher(str);

    if (matcher.find())
    {
        System.out.println(matcher.group());
    }
    else {
        System.out.println("No string found");
    }

    }
}

此代码找到我想要的“Gold 1176.40”字符串，但我无法将其保存为另一个字符串，如

String temp = matcher.group();

我该怎么做？

Answer 1

在if条件之前声明一个临时变量，然后将匹配的字符串附加到该temp变量。

String temp = "";
Pattern pattern = Pattern.compile("Gold(\\s{9})(\\d{4})\\.(\\d{2})");
Matcher matcher = pattern.matcher(str);

if (matcher.find())
{
    temp = temp + matcher.group();
}
else {
    System.out.println("No string found");
}

Answer 2

如果您感兴趣，可以单行进行。

String str = "----------------------------------------------------------------------"
                + "Metals          Bid        Ask           Change        Low       High "
                + "----------------------------------------------------------------------"
                + "Gold         1176.40     1177.40     -8.60  -0.73%    1171.90  1183.90";
String s = str.substring(str.indexOf("Gold"))).replaceAll("(Gold\\s{9}\\d{4}.\\d{2}).*", "$1");

在Java中使用正则表达式来提取子字符串

2 个答案: