람다식 최근 정보 추출을 위해 사용되는 구문(전화 번호, 이메일)

[주인장]

1. 패턴 클래스 

public class RegexPattern {

    public static final Pattern EMAIL_PATTERN = Pattern.compile(
            "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-z]{2,}", Pattern.CASE_INSENSITIVE );

     // 최신 전화 번호 패턴 적용 
    public static final Pattern PHONE_PATTERN = Pattern.compile(
            "^(010|02|0[3-9][1-9]|050[2-9]|070|080)[- ]?\\d{3,4}[- ]?\\d{4}$"
    );
}

2. 정보 추출 메소드 

public static CustomerInfo extractUserInformationFromChatHistory(List<ChatEntry> history) {
    if (history == null || history.isEmpty()) {
        return new CustomerInfo(null, null);
    }

    Optional<String> emailAddress = history.stream()
            .filter(entry -> "user".equalsIgnoreCase(entry.getRole()))
            .map(ChatEntry::getContent)
            .filter(content -> content != null && !content.isBlank())
            .map(CustomerInfoHelper::extractEmailAddress)
            .filter(Optional::isPresent)
            .map(Optional::get)
            .findFirst();

    Optional<String> phoneNumber = history.stream()
            .filter(entry -> "user".equalsIgnoreCase(entry.getRole()))
            .map(ChatEntry::getContent)
            .filter(content -> content != null && !content.isBlank())
            .map(CustomerInfoHelper::extractPhoneNumber)
            .filter(Optional::isPresent)
            .map(Optional::get)
            .findFirst();

    return new CustomerInfo(emailAddress.orElse(null), phoneNumber.orElse(null));
}