How can I search for a multiline pattern in a file?

Question

I needed to find all the files that contained a specific string pattern. The first solution that comes to mind is using find piped with xargs grep:

Answer 1

Here is a more useful example:

pcregrep -Mi "" afile.html

It searches the title tag in a html file even if it spans up to 5 lines.

Here is an example of unlimited lines:

pcregrep -Mi "(?s)" example.html