fix GITHUB_PAT_PATTERN and add instructions to README

Author: filipchristiansen

README.md

@@ -29,6 +29,7 @@ You can also replace `hub` with `ingest` in any GitHub URL to access the corresp
 ## 📚 Requirements
 
 - Python 3.7+
+- For private repositories: A GitHub Personal Access Token (PAT). You can generate one at [https://github.com/settings/personal-access-tokens](https://github.com/settings/personal-access-tokens) (Profile → Settings → Developer Settings → Personal Access Tokens → Fine-grained Tokens)
 
 ### 📦 Installation
 
@@ -83,6 +84,10 @@ gitingest /path/to/directory
 # From URL
 gitingest https://github.com/cyclotruc/gitingest
 
+# For private repositories, use the --token option
+# Get your token from https://github.com/settings/personal-access-tokens
+gitingest https://github.com/username/private-repo --token github_pat_...
+
 # See more options
 gitingest --help
 ```

src/gitingest/utils/git_utils.py

@@ -5,7 +5,7 @@
 import re
 from typing import List, Optional, Tuple
 
-GITHUB_PAT_PATTERN = r"^(?:github_pat_|gph_)[A-Za-z0-9_]{40,}$"
+GITHUB_PAT_PATTERN = r"^(?:github_pat_|gph_)[A-Za-z0-9_]{36,}$"
 
 
 async def run_command(*args: str) -> Tuple[bytes, bytes]:
@@ -262,5 +262,5 @@ def validate_github_token(token: str) -> None:
     if not re.match(GITHUB_PAT_PATTERN, token):
         raise ValueError(
             "Invalid GitHub token format. Token should start with 'github_pat_' or 'gph_' "
-            "followed by at least 40 characters of letters, numbers, and underscores."
+            "followed by at least 36 characters of letters, numbers, and underscores."
         )