rvest - scrape 2 classes in 1 tag

Question

I am new to rvest. How do I extract those elements with 2 class names or only 1 class name in tag?

This is my code and issue:

doc <- paste(\"

        

Answer 1

You can use css selector as follows:

Select class contains b1 not a1:

read_html(doc) %>% html_nodes(".b1:not(.a1)")
# {xml_nodeset (1)}
# [1]  text2 

Or use the attribute selector:

read_html(doc) %>% html_nodes("[class='b1']")
# {xml_nodeset (1)}
# [1]  text2 

Select class contains both:

read_html(doc) %>% html_nodes(".a1.b1")
# {xml_nodeset (1)}
# [1]  text1