The robots.txt analysis tool reads the robots.txt file in the same way Googlebot does. If the tool interprets a line as a syntax error, Googlebot doesn't understand that line. If the tool shows that a URL is allowed, Googlebot interprets that URL as allowed.
This tool provides results only for Google user-agents (such as Googlebot). Other bots may not interpret the robots.txt file in the same way. For instance, Googlebot supports an extended definition of the standard. It understands Allow: directives, as well as some pattern matching. So while the tool shows lines that include these extensions as understood, remember that this applies only to Googlebot and not necessarily to other bots that may crawl your site.
If a robots.txt file exists in the root directory of the host, this tool lists the information that Google has about it, including:
To analyze a site's robots.txt file:
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