Is pcre.org secure (HTTPS)?

Yes. pcre.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 28, 2026.

Hosting provider information for pcre.org is not available yet.

What is pcre.org's SEO score?

pcre.org scored 70/100 for SEO in the latest analysis (fair).

What is pcre.org's overall website score?

pcre.org has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.

pcre.org

PCRE - Perl Compatible Regular Expressions

Last scanned Jul 21, 2026, 11:40 AM · 2 views

Overall score

Fair

Top issues to fix

11 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Meta description longer than 160 characters
SEO
Trim the meta description to under 160 characters to avoid truncation in search results.

+5 more issues — details in the sections below.

Summary

The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. This website uses Nginx. SEO is fair (70/100) and accessibility is excellent (95/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.

SEO

5 issue(s) found

Performance

1.57 s

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Contact

Email, phone, and address published on this site's own pages.

Email: pcre2-dev@googlegroups.com webmaster@pcre.org

Meta tags

Title: PCRE - Perl Compatible Regular Expressions
Description: The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API as well as a set of wrapper functions that correspond to the POSIX regular expression API.
Canonical
Language: en
Charset
Viewport
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: 35.209.20.5
ASN: AS15169 43515 ()

DNS records

Type	Value
A	35.209.20.5
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: *.pcre.org
Valid from: May 30, 2026
Valid to: Aug 28, 2026
Days until expiry: 38
SAN domains: *.pcre.org, pcre.org

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 4 · H3 1

Links

10 internal · 29 external · 8 broken

Images

0 total · 0 missing alt

Scripts / Styles

0 scripts · 1 stylesheets

JS / CSS size

0 B · 630 B

Page size

7.8 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Meta description longer than 160 characters
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
sitemap.xml not found

Scan details

Requested URL: https://pcre.org
Final URL: https://www.pcre.org/
HTTP status: 200
HTTP version: HTTP/2
Response time: 1.57 s
HTML size: 7.8 KB
Redirect chain: https://pcre.org → https://www.pcre.org/

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Frequently asked questions

What technology does pcre.org use?: pcre.org is built with Nginx.
Is pcre.org secure (HTTPS)?: Yes. pcre.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 28, 2026.
Who hosts pcre.org?: Hosting provider information for pcre.org is not available yet.
What is pcre.org's SEO score?: pcre.org scored 70/100 for SEO in the latest analysis (fair).
What is pcre.org's overall website score?: pcre.org has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.