I have a file that is mixed with both normal text I need and html-tags. I know that with REGEX it is possible to recognize html tags and with sed one can swap those for an empty string, but I do not know how to apply it concretely. 
How can I delete html tags from a file using sed?
sed;regular expression;html
As long as your HTML tags are confined to a single line, the following will work:sed 's/<[^>]*>//g'