使用python从嵌套字符串中选取特定字符串

def find_string(nested_str, target):
    if isinstance(nested_str, str):
        if target in nested_str:
            return nested_str
    elif isinstance(nested_str, list):
        for item in nested_str:
            result = find_string(item, target)
            if result:
                return result
    elif isinstance(nested_str, dict):
        for key, value in nested_str.items():
            result = find_string(value, target)
            if result:
                return result
    return None

nested_str = {
    "key1": "value1",
    "key2": ["value2", "value3"],
    "key3": {
        "key4": "value4",
        "key5": "value5"
    }
}

target = "value3"
result = find_string(nested_str, target)
print(result)  # 输出：value3

import re

def find_string(nested_str, target):
    pattern = re.compile(target)
    if isinstance(nested_str, str):
        match = re.search(pattern, nested_str)
        if match:
            return match.group()
    elif isinstance(nested_str, list):
        for item in nested_str:
            result = find_string(item, target)
            if result:
                return result
    elif isinstance(nested_str, dict):
        for key, value in nested_str.items():
            result = find_string(value, target)
            if result:
                return result
    return None

nested_str = {
    "key1": "value1",
    "key2": ["value2", "value3"],
    "key3": {
        "key4": "value4",
        "key5": "value5"
    }
}

target = "value3"
result = find_string(nested_str, target)
print(result)  # 输出：value3