How to replace full file name with random number?

Question

Here is my code

"test.html".replace(/(?=\.[^.]+$)/g, Math.floor((Math.random() * 1000000) + 1))

How to convert test.html to random number.html like 38475.html?

`"test.html".replace(/^.+(?=\.[^.]+)/, Math.floor((Math.random() * 1000000) + 1))` — Pranav C Balan, Mar 01 '16 at 06:48
duplicate http://stackoverflow.com/questions/3954927/js-regex-how-to-replace-the-captured-groups-only?rq=1 — , Mar 01 '16 at 06:48

score 2 · Answer 1 · answered Mar 01 '16 at 06:48

2

if regex is not mandatory :), then try

 Math.floor((Math.random() * 1000000) + 1) + "." + "test.html".split( "." ).pop();

create a method

function randomizeFileName( fileName )
{
   return Math.floor((Math.random() * 1000000) + 1) + "." + fileName.split( "." ).pop();
}

answered Mar 01 '16 at 06:48

gurvinder372

any reason for using split.pop() instead lastIndexOf()? – Pavan Teja Mar 01 '16 at 06:53
@PavanTeja No specific reason, I just prefer to array methods as they are more readable and cleaner to use. – gurvinder372 Mar 01 '16 at 07:01

score 1 · Answer 2 · answered Mar 01 '16 at 06:49

1

Why do you have to use regex here? you can just use the randaom number appended with file extension of actual file.

 var fileName="test.html";

 fileName= Math.floor((Math.random() * 1000000) + 1)+fileName.substr(fileName.lastIndexOf('.'))

answered Mar 01 '16 at 06:49

Pavan Teja

2 Answers2