What URL parameter settings in GWT to choose for search results parameter?

[poiseo]

Hello,we're about to disallow search results from crawling in robots.txt, but in GWT we have to specify URL parameters.

URLs with 'search' parameter look like these: http://www.example.com/?search=keyword

So in GWT we're setting the following parameter: search

Question, what settings to set for it?

[Ray-pp]

if you'd like to instruct Google not to crawl the URLs with that parameter, select 'No URLs' in the Google Webmaster Tools > URL Parameters section.

Still, this is a guide for Google to follow and they do not always follow the rules set. Going the robots.txt method ensures that Google will not crawl those URLs.