Regex Map Maintenance Tools

To support the rapid search functionality (s command / search_rules.sh), we use a helper script that automatically annotates regex patterns with human-readable examples.

Why do we need this?

Our FUZZY_MAP.py files contain complex regular expressions. To make them searchable via fuzzy finders (fzf) without needing to understand the raw regex, we add # EXAMPLE: comments above the patterns.

Before:

('CreditCard', r'\b(?:\d[ -]*?){13,16}\b', ...)

After (Auto-generated):

# EXAMPLE: 1234-5678-9012-3456
('CreditCard', r'\b(?:\d[ -]*?){13,16}\b', ...)

The Tagger Script (map_tagger.py)

We provide a Python script that scans all FUZZY_MAP.py and FUZZY_MAP_pre.py files and generates these examples automatically.

Installation

The script requires the exrex library to generate random matches for complex regexes.

pip install exrex

Usage

Run the script from the project root:

python3 tools/map_tagger.py

Workflow

1. Create or Edit a Map file (e.g., adding new rules).

2. Run the tagger script.

3. Interactive Mode:

   • The script will show you a generated suggestion.

   • Press ENTER to accept it.

   • Type s to skip.

   • Type sa (skip all) if you want to skip all remaining patterns that fail generation.

4. Commit the changes.

Note: The script ignores existing # EXAMPLE: tags, so it is safe to run repeatedly.