To extract information about rendering engines and their versions from user agents, I can analyze the user agent string and search for specific keywords or patterns that indicate the rendering engine being used. Some popular rendering engines and their corresponding identifiers are:

Gecko (used by Firefox): look for "Gecko/" followed by the engine version number.

WebKit (used by Chrome, Safari, and others): look for "AppleWebKit/" followed by the engine version number.

Trident (used by Internet Explorer): look for "Trident/" followed by the engine version number.

Blink (used by recent versions of Chrome): look for "Chrome/" followed by the engine version number and "Safari/" or "Version/" followed by the Blink version number.
To extract the information about the rendering engine name and version, I can use regular expressions or string manipulation techniques to extract the relevant substrings from the user agent string. For example, to extract the Gecko version number, I can search for the substring "Gecko/" and then extract the digits that follow it. To extract the WebKit version number, I can search for the substring "AppleWebKit/" and then extract the digits that follow it.

Similarly, to analyze for language preferences, screen resolution, color depth, cookies supported, and referrer website, I can search for specific keywords or patterns in the user agent string and extract the relevant information. For example, to extract the language preference, I can look for the "Accept-Language" header in the user agent string and parse the language codes specified there. To extract the screen resolution and color depth, I can look for the "Screen" header and extract the relevant values. To extract the cookies supported flag, I can look for the "Cookie" header and check whether it is set to "1" or "0". And to extract the referrer website, I can look for the "Referer" header and extract the URL specified there.
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