VPN stands for Virtual Private Network. A VPN is a secure and encrypted connection that allows users to access the internet securely and privately by creating a private network from a public internet connection. It protects online privacy and security by hiding the user’s IP address and encrypting their internet traffic. VPNs are commonly used to bypass internet censorship, access geo-restricted content, and remotely connect to a company network. They can be accessed through software or apps on desktop, mobile, or other devices.
![local s = ""
local sstr = string.gmatch(s,'href%s*=%s*"([^"]+)"')
print(sstr()) 增加一个功能，左右两边可以是双引号或者单引号](https://linuxcpp.0voice.com/zb_users/upload/2023/05/202305162224299866311.png)
![local s = ""
local sstr = string.gmatch(s, 'href%s*=%s*["\']([^"\']+)[\'"]')
print(sstr()) 增加一个功能，开头可以是href、src、action](https://linuxcpp.0voice.com/zb_users/upload/2023/05/202305162217558813401.png)
