Detect Search Crawlers via JavaScript

Question

I am wondering how would I go abouts in detecting search crawlers? The reason I ask is because I want to suppress certain JavaScript calls if the user agent is a bot.

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Answer 1

The following regex will match the biggest search engines according to this post.

/bot|google|baidu|bing|msn|teoma|slurp|yandex/i
    .test(navigator.userAgent)

The matches search engines are:

• Baidu
• Bingbot/MSN
• DuckDuckGo (duckduckbot)
• Google
• Teoma
• Yahoo!
• Yandex

Additionally, I've added bot as a catchall for smaller crawlers/bots.