I have a few dynamic generated URLs.
Can I use regex to block these URLs in a robots.txt file?
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Regular Expressions are not valid in robots.txt, but Google, Bing and some other bots do recognise some pattern matching.
Say if you wanted to block all URLs that have a
example any where in the URL, you can use a wild card entry *
User-agent: * Disallow: /*example
You can also use the dollar sign $ to specify that the URLs must end that way. So if you wanted to block all URLs that end with
example, but not URLs that had a
example elsewhere in the URL you could use:
User-agent: * Disallow: /*example$
For blocking urls by regular expressions not from crawling (downloading) but from indexing in search engines you can use
dynamic addind of HTTP header
X-Robots-Tag into mod_rewrite rules of Apache (or nginx) that widely supports regular expressions.