import re

def remove_invalid_characters(input_string):
    # 置換対象の無効な文字を正規表現で指定
    pattern = r'[\\/:*?"<>|]+'
    # 置換文字列は空文字列に設定
    replacement = ''
    # 無効な文字を削除
    cleaned_string = re.sub(pattern, replacement, input_string)
    return cleaned_string

# 例: 無効な文字を含む文字列
original_string = '\\gbahsd:njs?<>|"asd/as*'
cleaned_result = remove_invalid_characters(original_string)
print(cleaned_result)  # 出力: 'gbahsdnjsasdas'