# Awk Range Pattern Edge Case Debugging

> Debugging technique for awk range patterns that collapse when start line matches end pattern

- Skill: `vamseeachanta/awk-range-pattern-edge-case-debugging` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/awk-range-pattern-edge-case-debugging`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/awk-range-pattern-edge-case-debugging/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: vamseeachanta (https://skillmd.com/u/vamseeachanta)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/vamseeachanta/awk-range-pattern-edge-case-debugging

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# Awk Range Pattern Edge Case Debugging

When using awk range patterns like `/start/,/end/`, be aware that if a line matches BOTH patterns, the range collapses to a single line instead of spanning multiple lines. Debug by: (1) verify the start and end patterns are mutually exclusive, (2) test the regex independently against sample input, (3) if the start line legitimately matches the end pattern, use a helper that skips the header line and captures subsequent indented/nested lines separately rather than relying on range matching.