Used By: WebDriver, C #
Code:
link = browser1.FindElements(By.CssSelector(a[href*=ibm])).ToList(); Extract links and get links in two categories. see screen 
And it is required to retrieve Category 1 links. I tried to change the selector to a[href*=ibm.com] , as well as other interpretations.
As a result, CssSelector stops working.
Question: How to choose the CssSelector , that links of the required domain were extracted?