如何搜索和高亮显示上下文中出现的每个字符串

def search_and_highlight(context, strings):
    highlighted_context = context

    for string in strings:
        positions = []
        start = 0

        while True:
            position = context.find(string, start)
            if position == -1:
                break
            positions.append(position)
            start = position + len(string)

        for position in positions:
            highlighted_context = highlighted_context[:position] + '<span style="background-color: yellow;">' + highlighted_context[position:position+len(string)] + '</span>' + highlighted_context[position+len(string):]

    return highlighted_context

# 示例用法
context = "这是一个示例上下文，其中包含一些字符串。"
strings = ["示例", "包含"]

highlighted_text = search_and_highlight(context, strings)
print(highlighted_text)