Java中正则表达式匹配逗号分隔的数字序列教程

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

public class NumberExtractor {

    public static List<String> extractNumbers(String input) {
        // 定义正则表达式：匹配1到2位的数字
        String regex = "\d{1,2}"; 
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(input);

        List<String> numbers = new ArrayList<>();
        while (matcher.find()) {
            numbers.add(matcher.group());
        }
        return numbers;
    }

    public static void main(String[] args) {
        String apiResponse1 = "1,2,23,21";
        String apiResponse2 = "3";
        String apiResponse3 = "123,45"; // 注意：123会被匹配成12
        String apiResponse4 = "abc,1,def,22";

        System.out.println("提取 "" + apiResponse1 + "": " + extractNumbers(apiResponse1)); // 输出: [1, 2, 23, 21]
        System.out.println("提取 "" + apiResponse2 + "": " + extractNumbers(apiResponse2)); // 输出: [3]
        System.out.println("提取 "" + apiResponse3 + "": " + extractNumbers(apiResponse3)); // 输出: [12, 45] (注意123只匹配12)
        System.out.println("提取 "" + apiResponse4 + "": " + extractNumbers(apiResponse4)); // 输出: [1, 22]
    }
}

import java.util.regex.Pattern;

public class NumberSequenceValidator {

    public static boolean isValidNumberSequence(String input) {
        // 定义正则表达式：匹配整个字符串是否为逗号分隔的1-2位数字序列
        String regex = "^\d{1,2}(,\d{1,2})*$";
        return Pattern.matches(regex, input);
        // 或者使用 input.matches(regex);
    }

    public static void main(String[] args) {
        String validResponse1 = "1,2,23,21";
        String validResponse2 = "3";
        String validResponse3 = "12,3";
        String invalidResponse1 = "1,2,123"; // 123是三位数
        String invalidResponse2 = "1,2,";    // 结尾有逗号
        String invalidResponse3 = ",1,2";    // 开头有逗号
        String invalidResponse4 = "1, 2";    // 包含空格
        String invalidResponse5 = "abc";     // 非数字

        System.out.println(""" + validResponse1 + "" 是有效的: " + isValidNumberSequence(validResponse1)); // true
        System.out.println(""" + validResponse2 + "" 是有效的: " + isValidNumberSequence(validResponse2)); // true
        System.out.println(""" + validResponse3 + "" 是有效的: " + isValidNumberSequence(validResponse3)); // true
        System.out.println(""" + invalidResponse1 + "" 是有效的: " + isValidNumberSequence(invalidResponse1)); // false
        System.out.println(""" + invalidResponse2 + "" 是有效的: " + isValidNumberSequence(invalidResponse2)); // false
        System.out.println(""" + invalidResponse3 + "" 是有效的: " + isValidNumberSequence(invalidResponse3)); // false
        System.out.println(""" + invalidResponse4 + "" 是有效的: " + isValidNumberSequence(invalidResponse4)); // false
        System.out.println(""" + invalidResponse5 + "" 是有效的: " + isValidNumberSequence(invalidResponse5)); // false
    }
}