Regex.ai generates regular expressions from plain-English descriptions and sample text, with explanations included.
Regex.ai removes regex archaeology from development. Describe the pattern you need — email addresses, dates, log lines — or provide sample matches and non-matches, and it writes the regular expression for you. Each result comes with an explanation of what the pattern does, and you can test against sample text in place. It supports multiple regex flavors so generated patterns behave correctly in your language.
Providing positive and negative samples is the killer workflow: paste the log lines that should match and a few that shouldn’t, and the generated pattern targets exactly that boundary. Flavor selection keeps patterns compatible with your language’s regex engine.
For occasional regex users, the explanation output is arguably more valuable than the pattern itself: understanding what each group and quantifier does prevents copy-paste errors later. The tool’s focus keeps it fast and dependency-free.
Regex.ai is free for basic generation with optional paid usage for higher volume and saved pattern libraries.
Developers, data engineers, and analysts who write regex occasionally and want it correct on the first try.
Yes for standard usage; heavier usage falls under paid tiers.
API access is available for embedding regex generation into developer tools and workflows.
Regex testers only validate what you wrote; Regex.ai writes and explains the pattern to begin with.
Common flavors used by JavaScript, Python, Java, and other ecosystems are selectable.
Yes, paste a pattern and receive a plain-English breakdown of its parts.
Yes, live testing against sample text validates patterns in the browser.
Yes, complex constructs including lookarounds are generated when the task requires them.
Yes, plain-English descriptions and explanations make regex approachable for newcomers.
Saved patterns and links make sharing generated regex straightforward.
Yes, paste a failing pattern with sample text and it diagnoses the issue and suggests a corrected version.
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