This routine applies the following REGEX (Regular Expression) to the indicated file.

  $file =~ s/<.*?>//g;

The effect is to substitute all < and > tags, plus everything between (.*?),
with nothing (//), throughout the file (globally).

Notes:
(File is usually HTML but not necessarily; tag-stripping would be useful e.g. when building a corpus of web pages.)

PLUS:   Square brackets & curly braces were added to tags in this stripping     routine in Jan 2016 and regular parentheses in Sept 2020. Choose here-->

[squares]   {curlies}   (regulars)

 1.  Text-Paste mode