regex to pick folders from network path - regex

Question

I'm trying to get a regex for selecting part of a network path
\\server.env.com\Target\Test1\Test2\final1\final2\final3\final4\final5
I need to skip two folders after Target and get the rest of the path from the above. So regex should give me final1\final2\final3\final4\final5 in this case. The path can have more levels of folders after final5. So the regex should work for any number of folders.
When I am using look behind, the browser says its not supported, so cannot use it.

Answer 1

Using regex...
var str1="path \\server.env.com\\Target\\Test1\\Test2\\final1\\final2\\final3\\final4\\final5"
// "path \server.env.com\Target\Test1\Test2\final1\final2\final3\final4\final5"
str1.match( /([^\\]*\\){5}(.*)/ )[2]
// "final1\final2\final3\final4\final5"
works based on a test for number of forward slashes prior to the 'finals'
Or, using split
var arr = str1.split("\\")
arr.splice(0,5)
var result = arr.join("\\")
result // "final1\final2\final3\final4\final5"

Answer 2

Following this post: How do you use a variable in a regular expression?
Create a regex that replaces everything up to Target and then two more sub-directories
var path = "\\server.env.com\\Target\\Test1\\Test2\\final1\\final2\\final3\\final4\\final5"
console.log("Path is: " + path)
var target = "Target"
var regex = "^.*" + target + "\\\\(?:[^\\\\]+\\\\){2}"
console.log("Regex is: "+ regex)
var re = new RegExp(regex, "mg")
var extracted = path.replace(re, "")
console.log("Extraction is: " + extracted)