Text & dev
Regex tester
Run JavaScript `RegExp` patterns against sample text and inspect matches.
Regular expressions are powerful but easy to get wrong. Paste a pattern, set flags (`g`, `i`, …), and run against real sample strings before shipping. This uses the same RegExp engine as modern browsers—behavior matches client-side code you write in JS.
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Quick links to related utilities—same workflow, different input or output.
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FAQs
Which regex dialect is this?›
JavaScript (ECMAScript) regular expressions, as implemented in your browser—not PCRE or Python rules.
Why does my pattern throw?›
Syntax errors (unclosed brackets, bad escapes) fail at compile time—fix the pattern string and retry.
How do I test multiline text?›
Use the `m` or `s` flags where appropriate, or split input in your test string.
General
Do these tools send my data to Exemplar’s servers?›
By default, conversion and formatting run entirely in your browser. Nothing is uploaded to Exemplar for normal paste-and-transform workflows. Tools that deliberately open an external service (for example, a third-party speed test) are called out on the page.
Do I need an account or install anything?›
No account is required. Everything runs in the browser—there is nothing to install for these utilities. They complement the Exemplar platform but work standalone.
Are these utilities open-source or the same as other sites?›
These pages are built for Exemplar’s audience (developers working with APIs, config, and ops data). Behavior may differ slightly from other online tools; always verify critical output in your own environment.
Are there size or performance limits?›
Very large inputs can slow down or crash the tab—especially for images, huge JSON, or multi‑MB HAR files. For production-scale data, prefer local CLI tools, streaming parsers, or your own pipelines.
Can I use output in production?›
Yes, when you have validated it. Parsers and formatters here aim to be helpful for everyday tasks but are not a substitute for tests, schema validation, or security review where it matters.
Where can I read more about privacy?›
See our Privacy policy at /privacy for how exemplar.dev handles site analytics and general data practices.