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regexguide.com

A free, in-browser regex explainer and pattern library. Paste any regular expression and get a plain-English, token-by-token breakdown; browse 300 tested patterns; and learn regex through guides, a glossary, and a 100+ question FAQ. Everything runs client-side — no signup, no upload, and no tracking of your regex content.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-27T16:48:26.988Z. Cached copy · Source on regexguide.com

# regexguide.com

> A free, in-browser regex explainer and pattern library. Paste any regular expression and get a plain-English, token-by-token breakdown; browse 300 tested patterns; and learn regex through guides, a glossary, and a 100+ question FAQ. Everything runs client-side — no signup, no upload, and no tracking of your regex content.

## Tools
- [Regex Explainer](https://regexguide.com/index.html#tool): Paste a regex, get a token-by-token plain-English explanation, live testing against your input, and generated code in 7 languages.
- [English → Regex](https://regexguide.com/from-english.html): Describe a pattern in plain English and get a regex. Rule-based and deterministic (not AI).
- [Flavor Converter](https://regexguide.com/convert.html): Convert a regex between JavaScript, Python, Java, .NET, Go, Ruby, and PCRE.
- [Visual Editor](https://regexguide.com/visual-editor.html): Build a regex by stacking configurable blocks.
- [Cheat Sheet](https://regexguide.com/cheat-sheet.html): One-page reference of every regex token, character class, group, anchor, and flag.

## Reference
- [Pattern Library — 300 patterns](https://regexguide.com/patterns.html): Tested regex patterns for validation, extraction, and parsing. Each has a token breakdown, tailored pitfalls, usage in 7 languages, authoritative sources, and a downloadable PDF cheat sheet.
- [Regex Glossary — 116 terms](https://regexguide.com/glossary.html): Definitions of regex terminology, with authoritative sources (RFC, Unicode, PCRE, POSIX).
- [FAQ — 100+ questions](https://regexguide.com/faq.html): The most-searched regex questions answered, with FAQPage structured data.

## Guides
- [Anchors and boundaries — pinning regex to specific positions](https://regexguide.com/guides/anchors.html)
- [Capture groups — every kind explained](https://regexguide.com/guides/capture-groups.html)
- [Advanced character classes](https://regexguide.com/guides/character-classes-advanced.html)
- [Character classes — the most expressive part of regex](https://regexguide.com/guides/character-classes.html)
- [The 10 mistakes that ruin most regex](https://regexguide.com/guides/common-mistakes.html)
- [Escaping special characters](https://regexguide.com/guides/escape-characters.html)
- [Regex flags deep dive](https://regexguide.com/guides/flags-deep-dive.html)
- [Groups and capture groups](https://regexguide.com/guides/groups-and-captures.html)
- [Lookaheads and lookbehinds — zero-width assertions](https://regexguide.com/guides/lookarounds.html)
- [Greedy vs lazy vs possessive — the three flavors of "more than one"](https://regexguide.com/guides/quantifiers.html)
- [Validating Indian IDs with regex](https://regexguide.com/guides/regex-aadhaar-pan.html)
- [Converting regex between flavors](https://regexguide.com/guides/regex-converting-flavors.html)
- [Regex flags — what each one does](https://regexguide.com/guides/regex-flags-complete.html)
- [Regex fundamentals — from zero to confident](https://regexguide.com/gui
…

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1. POST https://agentwebmap.com/v1/sites/regexguide.com/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://regexguide.com/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/regexguide.com/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/regexguide.com).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

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