Heres my code. I can't get it to work. I'd like to reiterate that I don't understand this solution and it is far beyond my capabilities.

```
CheckName = "user3"
CheckPass = "pass3"

path = r"C:\Users\\drago\\Desktop\PythonPractice\Accounts2.txt"
InFile = open(path, "r")
CredentialsString = str(InFile.read())
InFile.close()

import re

def check_password(check_username, check_password):
  for match in re.finditer(r'\[([^\[,\]]+),([^\[,\]]+)\]', CredentialsString):
    username, password = match.groups()

def check_password(CheckName,CheckPass):
    for match in re.finditer(CredentialsString):
        username, password = match.groups()

        if (username, password) == (check_username, check_password):
            print('Login successful')
            return

    print('Login unsuccessful')
```