I turned to another interesting feature in working with regular expressions (with Unicode characters). If you need to find a symbol, the number of significant digits of which in hexadecimal form is greater than or equal to three, then these numbers must be framed in curly braces.
Regex = "\\x{2014}",
Regex = "\\x{6C60}",
Octal numbers have much the same behavior.
The complete example is here.