In case of a managed object, Destructor is the method which is called when the unused objects are cleared up Garbage collector. Dispose method is called by the client of the object. By default Destructors are automatically created by the compiler where as you need to Implement IDisposable to implement Dispose method.
Oracle implementation of Regular expression has no support for using hexadecimal code to search for Unicode characters. The only way to search for Unicode character is it use the character itself. Normally with Regular expression, you can use \x or \u followed by hexadecimal code to search for any character. E.g. \x20 will match space. But REGEXP_LIKE in Oracle does not support \x. You need to use unistr function to convert the code to equivalent character and then use it with REGEXP_LIKE. E.g. REGEXP_LIKE(source,'[' ||unistr('\0020')|| ']');
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