# Batch Syntax Fix With Regex Line Based Fallback

> Fix repeated syntax errors across many files using regex, then fall back to line-based parsing when regex fails

- Skill: `vamseeachanta/batch-syntax-fix-with-regex-line-based-fallback` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/batch-syntax-fix-with-regex-line-based-fallback`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/batch-syntax-fix-with-regex-line-based-fallback/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- 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/batch-syntax-fix-with-regex-line-based-fallback

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# Batch Syntax Fix with Line-Based Fallback

When regex replacement fails on repeated syntax patterns across 10+ files, write a line-based fixer script that reads/writes line-by-line instead. Test the regex pattern on raw bytes first (`b'...'` notation) to catch invisible whitespace (e.g., `\n\n` vs `\n`). If regex misses edge cases, iterate with simpler patterns or switch to manual line parsing. Verify all files parse cleanly afterward with `ast.parse()` or equivalent before committing.