如何在Go语言中从URL中获取参数值？

针对URL https://www.example.com/signup?campaign=%27new_york%27，以下是几种提取campaign参数值new_york的实用方案：

1. 浏览器端原生JavaScript实现 #

利用浏览器内置的URLSearchParams解析参数，再去除值前后的单引号：

const url = new URL("https://www.example.com/signup?campaign=%27new_york%27");
let campaignValue = url.searchParams.get('campaign');
// 移除首尾的单引号
campaignValue = campaignValue.replace(/^'|'$/g, '');
console.log(campaignValue); // 输出：new_york

2. Python 实现 #

使用标准库urllib.parse解析URL和参数：

from urllib.parse import urlparse, parse_qs

url = "https://www.example.com/signup?campaign=%27new_york%27"
parsed_url = urlparse(url)
params = parse_qs(parsed_url.query)
# 获取参数值并去除首尾单引号
campaign_value = params['campaign'][0].strip("'")
print(campaign_value) # 输出：new_york

3. 正则表达式通用方案 #

如果不想依赖语言自带的URL解析工具，可通过正则匹配提取：

JavaScript 正则示例 #

const url = "https://www.example.com/signup?campaign=%27new_york%27";
const match = url.match(/campaign='([^']+)'/);
const campaignValue = match ? match[1] : null;
console.log(campaignValue); // 输出：new_york

Python 正则示例 #

import re

url = "https://www.example.com/signup?campaign=%27new_york%27"
match = re.search(r"campaign='([^']+)'", url)
campaign_value = match.group(1) if match else None
print(campaign_value) # 输出：new_york

内容的提问来源于stack exchange，提问作者MB360