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Phy Regex Audit

Category: Security  ·  Sub-category: security-misc  ·  Last updated:
type:audittype:scanner
Static ReDoS (Regular Expression Denial of Service) vulnerability scanner and regex quality auditor for codebases. Walks all source files to extract regex literals, detects catastrophic backtracking patterns (nested quantifiers, overlapping alternation, unbounded repetition on complex groups), severity-ranks each finding as CRITICAL/HIGH/MEDIUM, reports file and line number with the dangerous sub-pattern highlighted, identifies high-risk call sites (HTTP request handlers, form validators, URL parsers), and suggests safe rewrites using atomic groups or simplified alternatives. Also detects hardcoded locale assumptions (character classes assuming ASCII), overly permissive patterns, and regexes missing anchors. Supports JS/TS, Python, Go, Java, Ruby, PHP, Rust. Zero external API — pure static analysis. Triggers on "regex security", "ReDoS", "catastrophic backtracking", "regex audit", "slow regex", "regex vulnerability", "/regex-audit".

About this skill (catalog notes)

Phy Regex Audit includes 17 code blocks for direct copy-paste. At roughly 1,935 words the SKILL.md is on the longer end of the catalog distribution.

Source
myclaw.ai
License
MIT
Original author
ndesv21
Indexed lastmod
Catalog position
Security · security-misc
Indexed related skills
10

How Phy Regex Audit fits the catalog

Phy Regex Audit sits in the Security category under the security-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

One regex. One crafted input. Your Node.js server hangs for 30 seconds.

What this skill does

Phy Regex Audit is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/phy-regex-audit/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Phy Regex Audit Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/phy-regex-audit
curl -L https://claudskills.com/skills/phy-regex-audit/SKILL.md \
  -o ~/.claude/skills/phy-regex-audit/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/phy-regex-audit/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/phy-regex-audit/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\phy-regex-audit\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Phy Regex Audit Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/phy-regex-audit/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Phy Regex Audit skill do?
Static ReDoS (Regular Expression Denial of Service) vulnerability scanner and regex quality auditor for codebases. Walks all source files to extract regex literals, detects catastrophic backtracking patterns (nested quantifiers, overlapping alternation, unbounded repetition on complex groups), severity-ranks each finding as CRITICAL/HIGH/MEDIUM, reports file and line number with the dangerous sub-pattern highlighted, identifies high-risk call sites (HTTP request handlers, form validators, URL parsers), and suggests safe rewrites using atomic groups or simplified alternatives. Also detects hardcoded locale assumptions (character classes assuming ASCII), overly permissive patterns, and regexes missing anchors. Supports JS/TS, Python, Go, Java, Ruby, PHP, Rust. Zero external API — pure static analysis. Triggers on "regex security", "ReDoS", "catastrophic backtracking", "regex audit", "slow regex", "regex vulnerability", "/regex-audit".
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Phy Regex Audit skill?
Use Phy Regex Audit when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Phy Regex Audit" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Phy Regex Audit skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Phy Regex Audit is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ndesv21. (2026). Phy Regex Audit [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/phy-regex-audit/
BibTeX
@misc{phy-regex-audit-2026,
  author    = {ndesv21},
  title     = {Phy Regex Audit [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/phy-regex-audit/}
}

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