regex101.com
regex101: build, test, and debug regex
Last scanned Jul 26, 2026, 12:25 AM · 2 views
Overall score
Great
Summary
Online regex tester and debugger. This website uses Nginx hosted on HETZNER-AS - Hetzner Online GmbH, DE. SEO is good (85/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance good (85/100). Top issue: Missing canonical link.
Online regex tester and debugger. Test, explain, benchmark, and generate code for PCRE2, JavaScript, Python, Go, Java, .NET, and Rust.
- Germany
- Hosted on HETZNER-AS - Hetzner Online GmbH, DE
Top issues to fix
4 issues found · 1 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
1 broken link on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
2 issue(s) found
Performance
123 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Online regex tester and debugger. Test, explain, benchmark, and generate code for PCRE2, JavaScript, Python, Go, Java, .NET, and Rust.
Contact
Email, phone, and address published on this site's own pages.
- firas@digidib.dev
Meta tags
- Title
- regex101: build, test, and debug regex
- Description
- Online regex tester and debugger. Test, explain, benchmark, and generate code for PCRE2, JavaScript, Python, Go, Java, .NET, and Rust.
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, minimum-scale=1.0, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover
- Robots meta
- Manifest
- https://regex101.com/static/assets/manifest.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- HETZNER-AS - Hetzner Online GmbH, DE
- CDN provider
- —
- IP address
- 78.47.220.195
- ASN
- AS24940 (HETZNER-AS - Hetzner Online GmbH, DE)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- regex101.com
- Valid from
- Jun 25, 2026
- Valid to
- Sep 23, 2026
- Days until expiry
- 59
- SAN domains
- docs.regex101.com, logs.regex101.com, regex101.com, status.regex101.com, www.regex101.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 8 · H3 0
Links
7 internal · 1 external · 1 broken
Images
0 total · 0 missing alt
Scripts / Styles
7 scripts · 2 stylesheets
JS / CSS size
1.3 MB · 121 KB
Page size
64.7 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 2
- sitemap.xml
- Found
- URLs in sitemap
- 4
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
Accessibility issues
No accessibility issues detected.
Careers
This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.
Scan details
- Requested URL
- https://regex101.com
- Final URL
- https://regex101.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 122 ms
- HTML size
- 64.7 KB
- Redirect chain
- https://regex101.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does regex101.com use?
- regex101.com is built with Nginx.
- Is regex101.com secure (HTTPS)?
- Yes. regex101.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 23, 2026.
- Who hosts regex101.com?
- regex101.com is hosted on HETZNER-AS - Hetzner Online GmbH, DE.
- What is regex101.com's SEO score?
- regex101.com scored 85/100 for SEO in the latest analysis (great).
- What is regex101.com's overall website score?
- regex101.com has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.
- Is regex101.com hiring?
- regex101.com has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card