Regular expression for finding class names in HTML

Question

I\'d like to use grep to find out if/where an html class is used across a bunch of files. The regex pattern should find not only

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Answer 1

How about something like this:

grep -Erno 'class[ \t]*=[ \t]*"[^"]+"' *

That will also allow for more whitespace and should give you output similar to:

1:class="foo bar baz"
3:class = "haha"

To see all classes used, you can pipe output from the above into the following:

cut -f2 -d'"' | xargs | sort | uniq