Just add a method .clean to String which does:
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convert invalid UTF-8 strings from ISO-8859-15 to UTF-8 to fix them
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recognize euro char from both ISO 8859-15 and Windows-1252
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replace rn and r with n normalizing end of lines
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replace control characters and other invisible chars by spaces
Supports only Ruby 2.6+
sudo gem install string_cleaner
"\210\004".clean # => " "
Copyright © 2009 Joseph Halter. See LICENSE for details.