Finding non-ASCII characters

Sourced from Stackoverflow.com (https://stackoverflow.com/questions/2124010/grep-regex-to-match-non-ascii-characters) thanks to Alix Axel This will match a single non-ASCII character: [^\x00-\x7F] This is a valid PCRE (Perl-Compatible Regular Expression). You can also use the POSIX shorthands: [[:ascii:]] - matches a single ASCII char [^[:ascii:]] - matches a single non-ASCII char For Libre Calc or Libre Write do a Find & Replace (Ctrl + H) to get this menu: