如何搜索子字符串，并返回其右侧10个字符的所有值

def search_substring(string, substring):
    results = []
    index = 0
    while index < len(string):
        # 查找子字符串
        found_index = string.find(substring, index)
        if found_index == -1:
            break

        # 截取子字符串右侧的10个字符
        value = string[found_index + len(substring):found_index + len(substring) + 10]
        results.append(value)

        # 更新索引继续查找
        index = found_index + 1

    return results

# 测试代码
string = "This is a test string for substring search. The search string is 'is'."
substring = "is"
results = search_substring(string, substring)
print(results)

[' a test st', "'is'.\n"]