regexr.com
RegExr: Learn, Build, & Test RegEx
Last scanned Jul 26, 2026, 11:19 AM
Overall score
Fair
Summary
Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns. This website uses Google Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (75/100) and accessibility is fair (60/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.
Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.
- United States
- Hosted on Cloudflare
Top issues to fix
11 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
+5 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
997 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.
Contact
Email, phone, and address published on this site's own pages.
Source: https://regexr.com/contact
Meta tags
- Title
- RegExr: Learn, Build, & Test RegEx
- Description
- Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.
- Canonical
- Language
- Charset
- UTF-8
- Viewport
- width=device-width,initial-scale=1,user-scalable=0
- Robots meta
- Manifest
- https://regexr.com/assets/icons/site.webmanifest?1
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.67.191.157
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- regexr.com
- Valid from
- Jun 18, 2026
- Valid to
- Sep 16, 2026
- Days until expiry
- 49
- SAN domains
- regexr.com, *.regexr.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 9 · H2 0 · H3 0
Links
0 internal · 2 external · 0 broken
Images
1 total · 1 missing alt
Scripts / Styles
7 scripts · 2 stylesheets
JS / CSS size
337 KB · 324 B
Page size
35.3 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 12
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
- Missing <html lang> attribute
Scan details
- Requested URL
- https://regexr.com
- Final URL
- https://regexr.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 997 ms
- HTML size
- 35.3 KB
- Redirect chain
- https://regexr.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does regexr.com use?
- regexr.com is built with Google Analytics, Cloudflare Analytics.
- Is regexr.com secure (HTTPS)?
- Yes. regexr.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 16, 2026.
- Who hosts regexr.com?
- regexr.com is hosted on Cloudflare, behind Cloudflare CDN.
- What is regexr.com's SEO score?
- regexr.com scored 75/100 for SEO in the latest analysis (fair).
- What is regexr.com's overall website score?
- regexr.com has an overall SiteGraph score of 76/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card