Regex Generator & Explainer
Describe what you want to match and get a JavaScript regular expression, or paste an existing regex to get a plain-language explanation. PocketSpry’s AI returns the pattern, flags, a summary, a breakdown, and caveats. This tool generates and explains regexes — it does not run them; use PocketSpry’s Regex Tester to test a pattern locally in your browser.
Generate a JavaScript regex from plain English
Choose Generate, describe what should match, and optionally add examples that should or should not match. PocketSpry’s AI returns JavaScript RegExp source, the flags it used, a short summary, a breakdown of the pattern, and caveats. Enter the pattern into PocketSpry’s Regex Tester to run it.
Explain an existing regular expression
Choose Explain and paste a JavaScript regular expression (source only, without /…/ delimiters) plus any flags. The tool returns a plain-language breakdown of the anchors, character classes, groups, quantifiers, lookarounds, alternation, and flags. It echoes your pattern and flags exactly — it does not rewrite, fix, or optimize them.
Test generated regexes before using them
AI-generated regular expressions are suggestions based on your description, not tested or guaranteed-correct results. Natural-language requirements can be ambiguous, and a pattern’s edge cases and performance depend on real input. Use PocketSpry’s Regex Tester with representative examples to check a pattern before relying on it.
JavaScript regex syntax
This tool targets JavaScript RegExp, not PCRE, Python, Ruby, Java, or .NET. If a request needs syntax that JavaScript does not support, the tool explains the limitation and suggests the closest reasonable JavaScript approach rather than silently switching dialects. It is an AI-backed tool, so your description or regex is sent to PocketSpry’s AI service to produce the result.
Frequently asked questions
- What does the Regex Generator do?
- It turns a plain-language requirement into JavaScript RegExp source and flags.
- What does the Regex Explainer do?
- It explains an existing JavaScript regex in plain language.
- What regex flavor does it use?
- JavaScript RegExp.
- Does it support PCRE or Python regex?
- No. It uses JavaScript RegExp semantics.
- Should I include /slashes/ around my pattern?
- No. Enter the pattern source and put flags in the Flags field.
- Can I provide examples that should match?
- Yes, in Generate mode. You can also provide examples that should not match.
- Does the AI actually test the regex?
- No. Use PocketSpry’s Regex Tester to run it safely against representative text.
- Are generated regexes guaranteed correct?
- No. They are AI-generated suggestions and should be tested before you rely on them.
- Does it automatically optimize regex performance?
- No. It aims for clear, reasonable patterns, not formal performance optimization.
- Does it support capture groups?
- Yes. The generator can use JavaScript capture groups when needed, and the explainer describes them.
- Does it support named capture groups?
- Yes, where they are part of JavaScript RegExp syntax.
- What flags can it use?
- JavaScript RegExp flags such as d, g, i, m, s, u, v, and y, subject to browser/runtime support when the pattern is later executed.
- Does PocketSpry send my request to AI?
- Yes. This is an AI-backed tool; your description or regex is sent to PocketSpry’s AI service to generate the result.
- Does PocketSpry put my regex into analytics?
- No. Your description, regex, and results are not sent to analytics.