在许多编程语言中，可以使用正则表达式的捕获组功能来捕获第一次或第二次匹配。下面是一些代码示例：

1. Python示例：

import re

text = "The quick brown fox jumps over the lazy dog"
pattern = r"(quick|brown)"

matches = re.findall(pattern, text)
first_match = matches[0] if len(matches) > 0 else None
second_match = matches[1] if len(matches) > 1 else None

print("First match:", first_match)
print("Second match:", second_match)

2. JavaScript示例：

const text = "The quick brown fox jumps over the lazy dog";
const pattern = /(quick|brown)/;

const matches = text.match(pattern);
const firstMatch = matches && matches[1];
const secondMatch = matches && matches[2];

console.log("First match:", firstMatch);
console.log("Second match:", secondMatch);

3. Java示例：

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

public class RegexExample {
    public static void main(String[] args) {
        String text = "The quick brown fox jumps over the lazy dog";
        String pattern = "(quick|brown)";

        Pattern regexPattern = Pattern.compile(pattern);
        Matcher matcher = regexPattern.matcher(text);

        String firstMatch = null;
        String secondMatch = null;

        if (matcher.find()) {
            firstMatch = matcher.group(1);
            if (matcher.find()) {
                secondMatch = matcher.group(1);
            }
        }

        System.out.println("First match: " + firstMatch);
        System.out.println("Second match: " + secondMatch);
    }
}

这些示例演示了如何使用正则表达式的捕获组来捕获第一次或第二次匹配。根据所使用的编程语言，方法可能会有所不同，但基本思路是一样的。