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Boolean Strings

booleanstrings.com/all-the-40-forty-custom-sea… How-To Guides Publication

Boolean Strings collects custom search engines and resources about Boolean search, with an accompanying ebook announcement.

Visit Boolean Strings
booleanstrings.com/all-the-40-forty-custom-sea…
Boolean Strings homepage screenshot

About Boolean Strings

Boolean Strings maintains a collection of 40 Google Custom Search Engines, which Google renamed to Programmable Engines, for sourcing tasks such as finding LinkedIn profiles, GitHub repositories, resumes, documents, email formats, and contact information. The collection includes diversity-focused engines and engines that query Schema.org objects such as datasets, jobs, and CVs.

The page also points to how-to posts, a webinar, and an announced ebook on custom search described as soon to be released. It lists most currently working engines and invites requests for new ones.

Key features

  • X-ray LinkedIn, XING, GitHub, and Dev.to for profiles
  • Find resumes including Behance, developer, and HiddenResumes.com sources
  • Discover email formats and contact info by domain or name
  • Search GitHub repositories by language combination and location
  • Run diversity searches for women profiles and veteran candidates
  • Search documents, file types, datasets, jobs, and code
Best for: Sourcers and recruiters who use Boolean search to find candidates and professional profiles.
Good for
  • Brings 40 working custom search engines together on one page
  • Includes how-to posts and a webinar about CSEs
  • Author invites requests for additional custom search engines
Watch out for
  • Announced ebook is described as soon to be released, not yet available
  • Page states it includes most, not all, currently working engines

Boolean Strings at a glance

Type
Publication
Platforms
Web
Language
English
Last checked
Oct 5, 2026 · Online when checked
Listed
Oct 5, 2026
custom search

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Boolean Strings FAQ

Can I request a new custom search engine?
Yes, the page invites readers to describe the kind of CSE they want and says it will be added.
How do I use Email Format Discovery?
Enter an email domain in quotes.
How can I search without being interrupted by captchas?
Use the Search Everything engine instead of Google.
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Listing maintained by Chris McClure and the WebIndexly editors · Updated Oct 11, 2026 · How we rank