从分号分隔的字符串中获取不同的电子邮件

import re

def get_emails_from_string(string):
    email_pattern = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b'
    emails = set()
    
    strings = string.split(';')
    for s in strings:
        matches = re.findall(email_pattern, s)
        if matches:
            for match in matches:
                emails.add(match)
    
    return ';'.join(emails)

# 示例用法
string = 'john@example.com;alice@example.com;john@example.com;jane@example.com'
emails = get_emails_from_string(string)
print(emails)