import re


def remove_comments(json_str):
    # 移除 // 和 /* */ 注释
    pattern = r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"'
    regex = re.compile(pattern, re.DOTALL | re.MULTILINE)

    def replacer(match):
        s = match.group(0)
        if s.startswith('/'):
            return ''
        return s

    return regex.sub(replacer, json_str)