javascript - Validating a Url in Node.js -


hi there want validate url of types www.google.com or http://www.google.com or google.com using single reguar expression,is achievable,if so, kindly share solution in javascript. please note expect underlying protocols http or https morover main question on hand how can map these 3 patterns using 1 single regex expression in javascript doesn't have check whether page active or not,if value entered user matches of above listed 3 case should return true on other hand if doesnt should return fasle.

checking if url live

this bit of hack, buy if required so, how approach it:

1st step

parse , extract domain/ip given url

  • e.g. http://drive.google.com/0/23 ------> drive.google.com

this how in nodejs:

var url = require("url"); var result = url.parse('http://drive.google.com/0/23'); console.log(result.hostname);

2nd step

ping extracted domain/ip - not servers respond icmp (ping) requests due network configuration.

var ping = require ("net-ping");  var session = ping.createsession ();  session.pinghost (target, function (error, target) {     if (error)         console.log (target + ": " + error.tostring ());     else         console.log (target + ": alive"); });

3rd step

you can perform http request url , check status code.

var request = require('request'); request('http://www.google.com', function (error, response, body) {   if (!error && response.statuscode == 200) {     console.log(body) // show html google homepage.   } })
  • it's bit risky if web-service (since can trigger actions).
  • would more complicated if url requires authentication / redirection
  • check out request package

there's package that!

you can use existing nodejs package called validurl

usage:

var validurl = require('valid-url');  var url = "http://bla.com" if (validurl.isuri(url)){     console.log('looks uri'); }  else {     console.log('not uri'); }

installation:

npm install valid-url --save

if still want simple regex

google friend. check out


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