Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Disallow wildcard match in Robots.txt
-
This is in my robots.txt file, does anyone know what this is supposed to accomplish, it doesn't appear to be blocking URLs with question marks
Disallow: /?crawler=1
Disallow: /?mobile=1Thank you
-
This is a good reply.
Everyone gets really confused because Robots.txt has very minor, partial wildcard support and that makes people think that Robots.txt files use Regex, which they do not. Instead of having some weird half and half implementation, it would be much better IMO if the Robots.txt initiative / directive were updated to say "yes, you can use full regular expressions with regards to URL string matching".
Many people are left in a kind of silly guessing game because Google doesn't 'properly' elaborate or invest in expanding the definitions to their currently (publicly) assumed end-game.
People assume that if "*" will match any string of characters, "?" will match any individual character when used in a robots.txt file. This would make sense, but it's not the case. AFAIK there are only one or two supported wildcard characters in Robots.txt and that's why people get confused, looking for escape characters and the suchlike.
-
Hi Amanda,
Those lines tell GoogleBot not to crawl urls that have that text fragments.
For example, wont crawl: domain.com/category/product**?mobile=1**BUT, that doesnt mean that will not crawl every URL with question marks. For that, the line should be like this:
Disallow: /*?I do highly recommend you to read this guides:
About /robots.txt - Official site - Robotstxt.org
Robots.txt - Moz
Robots.txt: the ultimate guide - YOAST
The Complete Guide to Robots.txt - PORTENTHope it helps.
Best luck.
GR
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
What is the importance of exact match keywords for local SEO in service industry businesses?
I am working with a local service contractor. Several of his competitors have domain names with exact match keywords. Audits of competitor sites and use of other research tools reveals that their sites are behind in content and technical SEO. The competitor sites consistently rank higher in organic search results. I am new to SEO and I understand that some of my lack of clarity here is a result of not understanding the value of key word use in local SEO vs. wider efforts.
Technical SEO | | Andrew Woffenden16 -
One robots.txt file for multiple sites?
I have 2 sites hosted with Blue Host and was told to put the robots.txt in the root folder and just use the one robots.txt for both sites. Is this right? It seems wrong. I want to block certain things on one site. Thanks for the help, Rena
Technical SEO | | renalynd270 -
Is sitemap required on my robots.txt?
Hi, I know that linking your sitemap from your robots.txt file is a good practice. Ok, but... may I just send my sitemap to search console and forget about adding ti to my robots.txt? That's my situation: 1 multilang platform which means... ... 2 set of pages. One for each lang, of course But my CMS (magento) only allows me to have 1 robots.txt file So, again: may I have a robots.txt file woth no sitemap AND not suffering any potential SEO loss? Thanks in advance, Juan Vicente Mañanas Abad
Technical SEO | | Webicultors0 -
Staging & Development areas should be not indexable (i.e. no followed/no index in meta robots etc)
Hi I take it if theres a staging or development area on a subdomain for a site, who's content is hence usually duplicate then this should not be indexable i.e. (no-indexed & nofollowed in metarobots) ? In order to prevent dupe content probs as well as non project related people seeing work in progress or finding accidentally in search engine listings ? Also if theres no such info in meta robots is there any other way it may have been made non-indexable, or at least dupe content prob removed by canonicalising the page to the equivalent page on the live site ? In the case in question i am finding it listed in serps when i search for the staging/dev area url, so i presume this needs urgent attention ? Cheers Dan
Technical SEO | | Dan-Lawrence0 -
Are robots.txt wildcards still valid? If so, what is the proper syntax for setting this up?
I've got several URL's that I need to disallow in my robots.txt file. For example, I've got several documents that I don't want indexed and filters that are getting flagged as duplicate content. Rather than typing in thousands of URL's I was hoping that wildcards were still valid.
Technical SEO | | mkhGT0 -
Will an XML sitemap override a robots.txt
I have a client that has a robots.txt file that is blocking an entire subdomain, entirely by accident. Their original solution, not realizing the robots.txt error, was to submit an xml sitemap to get their pages indexed. I did not think this tactic would work, as the robots.txt would take precedent over the xmls sitemap. But it worked... I have no explanation as to how or why. Does anyone have an answer to this? or any experience with a website that has had a clear Disallow: / for months , that somehow has pages in the index?
Technical SEO | | KCBackofen0 -
Oh no googlebot can not access my robots.txt file
I just receive a n error message from google webmaster Wonder it was something to do with Yoast plugin. Could somebody help me with troubleshooting this? Here's original message Over the last 24 hours, Googlebot encountered 189 errors while attempting to access your robots.txt. To ensure that we didn't crawl any pages listed in that file, we postponed our crawl. Your site's overall robots.txt error rate is 100.0%. Recommended action If the site error rate is 100%: Using a web browser, attempt to access http://www.soobumimphotography.com//robots.txt. If you are able to access it from your browser, then your site may be configured to deny access to googlebot. Check the configuration of your firewall and site to ensure that you are not denying access to googlebot. If your robots.txt is a static page, verify that your web service has proper permissions to access the file. If your robots.txt is dynamically generated, verify that the scripts that generate the robots.txt are properly configured and have permission to run. Check the logs for your website to see if your scripts are failing, and if so attempt to diagnose the cause of the failure. If the site error rate is less than 100%: Using Webmaster Tools, find a day with a high error rate and examine the logs for your web server for that day. Look for errors accessing robots.txt in the logs for that day and fix the causes of those errors. The most likely explanation is that your site is overloaded. Contact your hosting provider and discuss reconfiguring your web server or adding more resources to your website. After you think you've fixed the problem, use Fetch as Google to fetch http://www.soobumimphotography.com//robots.txt to verify that Googlebot can properly access your site.
Technical SEO | | BistosAmerica0 -
Removing robots.txt on WordPress site problem
Hi..am a little confused since I ticked the box in WordPress to allow search engines to now crawl my site (previously asked for them not to) but Google webmaster tools is telling me I still have robots.txt blocking them so am unable to submit the sitemap. Checked source code and the robots instruction has gone so a little lost. Any ideas please?
Technical SEO | | Wallander0