I have url : http://www.website.com/shopping/books/?b=9

I disallowed /?b=9 from robots.txt


User-agent: *
Disallow: /?b=9

But when i test this from Google Webmaster, on Robots.txt Test Tools, it Shows this page allowed while it should not...

Please tell any wrong with my robots.txt


URL - http://www.website.com/shopping/books/?b=9

there /?b=9 this will be same in all cases and /shopping/books/ will be change with different category.

How to Block this types of string ?

Disallow: /?b=9 

Is it correct ?

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