# Configurable Normalization and Regex System

* **Task ID:** configurable-normalization-and-regex_68.stevejs.md
* **Reviewer:** stevejs
* **Area:** code
* **Motivation (WHY):**
  - Current normalization is hardcoded (whitespace collapse, line break removal)
  - Sentence detection patterns are hardcoded in regex-automata DFA
  - Users need flexibility for different text corpora and analysis requirements
  - Tab removal (task 66) is just one example of needed normalization control
  - Research workflows may need different boundary detection rules
* **Acceptance Criteria:**
  1. Configuration system supports customizable normalization rules
  2. Configuration system supports customizable sentence boundary regex patterns
  3. Default configuration maintains current behavior (backward compatibility)
  4. Tab removal can be configured on/off (addresses task 66 requirements)
  5. Configuration can be loaded from file or CLI arguments
  6. All existing tests pass with default configuration
  7. New tests validate configuration override behavior
* **Deliverables:**
  - Configuration struct and parsing logic
  - Configurable normalization module
  - Configurable sentence detection pattern system
  - CLI integration for configuration options
  - Documentation for configuration options
  - Unit tests for configuration system
* **References:**
  - Task remove-tabs-normalization_66.stevejs.md (specific normalization case)
  - PRD Section 7 (CLI & Config requirements)
  - PRD F-6 (normalization requirements)
  - PRD F-3, F-5 (sentence detection requirements)

## Pre-commit checklist:
- [ ] All deliverables implemented
- [ ] Tests passing (`cargo test`)
- [ ] Claims validated (`cargo test -- --nocapture | grep -E "(concurrent|parallel|faster|optimized)"` + manual verification)
- [ ] Documentation updated if needed
- [ ] **ZERO WARNINGS**: `./scripts/validate_warning_free.sh` passes completely