How to check whether the IP address is legal in javascript

Javascript method to verify whether the IP address is legal: first create a js sample file; then verify whether the IP address is legal through js regular expressions, code such as "function isValidIP(ip){...}" .

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How does JavaScript verify whether the IP address is legal?

js regular expression to verify legal IP address

The code is as follows:

function isValidIP(ip) {
    var reg = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/
    return reg.test(ip);
} 
 
let a = isValidIP('10.10.10.1111')
console.log(a)

[Recommended learning: javascript advanced tutorial]

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