Regular Expression

1. To search for unicode character sets used in certain languages, one can use \p properties, i.e. perluniprops. Such as the following to search for a part of strings composed Arabic letters and/or spaces.
   grep '[\s\p{Arabic}]*'
   https://perldoc.perl.org/perluniprops.html#Properties-accessible-through-%5cp%7b%7d-and-%5cP%7b%7d
2.