Regex returns string undefined

Question

I am trying to extract hash value from an magnet link but it returns undefined

var tesst = \"magnet:?xt=urn:btih:2B78EDFDDC87DC9605FB285997A80B787888C19         


        

Answer 1

You can use this regex

/([^:]+)&$/

and use test[1]

console.log(str.match(/([^:]+)&$/)[1]);