RegExp.$1 not get the right value

[Fndroid]

When I tried to use RegExp by calling .test(), I got different results when the code was obfuscatied.

Here is the sample code to reproduce the issue: gist

Expected Behavior

The code above should log the host(127.0.0.1:54637) of the url to the console

Current Behavior

By running multiple times of npm run test, I got different results.

Steps to Reproduce

1. clone the code from gist
2. install deps npm install
3. run npm run test

Your Environment

• Obfuscator version used: 2.9.4
• Node version used: v12.16.3

Stack trace

no error throw in this case.

Minimal working example that will help to reproduce issue

gist

[da411d]

I did some test and there is what i get:

// Test 1
/(.+)/.test("12345");
console.log(RegExp.$1); //> 12345

// Test 2
/(.+)/.test("12345");
"a".replace(/=+$/, "");
console.log(RegExp.$1); //> 12345

// Test 3
/(.+)/.test("12345");
"a==".replace(/=+$/, "");
console.log(RegExp.$1); //> 

Looks like RegExp.$1 resets after other regex. Such used in rc4 or base64 decode helper.
I think problem is in AtobTemplate.ts. Replacing with regex should be replaced with something else. Maybe substring? Or just putting all base64 strings to code without "=" in the end.

[sanex3339]

I'll try to remove padding characters from the base64 encoded strings, and as result - remove this regexp that just trims these padding characters during decoding. Also this slightly decreases obfuscated code size with base64 and rc4 encodings.

[sanex3339]

Released as 2.10.1