comparison
voiddo regexlab vs regex101
Both test and highlight regex matches in real time. voiddo regexlab ships a 30+ pattern library with individual test pages, and runs entirely in your browser. regex101 supports multiple non-JavaScript engines. Here is when each makes sense.
use voiddo regexlab when…
- you need a ready-to-use regex for email, UUID, URL, IBAN, JWT, semver, or 30+ more patterns
- your test data is sensitive (you want zero server calls)
- you are writing JavaScript/TypeScript code
- you want an ad-free, no-account experience
use regex101 when…
- you need PCRE2, Python, Go, or Java engine behavior
- you need token-level explanation of complex patterns
- you want to save and share regex permalinks
feature comparison
| feature | voiddo regexlab | regex101 |
|---|---|---|
| Real-time match highlighting | ✓ yes | ✓ yes |
| Named capture groups | ✓ yes (JS engine) | ✓ yes |
| Multiple regex engines | ✗ JS only | ✓ PCRE2, Python, Go, Java, JS |
| Token-level explanation | ✗ no | ✓ yes (detailed) |
| 30+ named pattern library | ✓ yes (email, UUID, IBAN, JWT…) | ✗ no curated library |
| Individual pattern test pages | ✓ yes (35+ pages) | ✗ no |
| Data sent to server | ✓ never (JS engine is browser-only) | PCRE2/Python/Go/Java engines: yes |
| Saved patterns / permalinks | ✗ no | ✓ yes (account or anonymous) |
| No account required | ✓ yes | ✓ yes (anonymous) |
| No ads | ✓ yes | ad-supported on free tier |
| Price | ✓ free | ✓ free (paid tier available) |
FAQ
Is voiddo regexlab an alternative to regex101?
Yes. voiddo regexlab is a free browser-only regex tester with real-time match highlighting, capture group display, and a library of 30+ named ready-to-use patterns (email, UUID, URL, IPv4, IBAN, JWT, credit card, semver, and more). It runs entirely in your browser using the JavaScript regex engine.
What does regex101 have that voiddo regexlab does not?
regex101 supports multiple regex engines (PCRE2, Python, Go, Java) and provides a detailed token-level explanation of each part of your pattern. voiddo regexlab uses the JavaScript (ECMAScript 2024) engine only. If you need PCRE2 lookbehind or Python named group syntax, regex101 is the better choice.
What does voiddo regexlab have that regex101 does not?
voiddo regexlab ships 30+ curated named patterns with individual test pages. You can navigate to
tools.voiddo.com/regex/match-email-address/, match-uuid/, match-iban/, or any of 35 other specific patterns and immediately test your input against the canonical regex for that format. regex101 does not include a curated pattern library.Is voiddo regexlab free?
Yes. voiddo regexlab is completely free with no account required, no rate limits, and no ads. It is MIT-licensed and part of the 44 free tools at tools.voiddo.com.
related comparisons