How to get only the filename and extension for a text item?

Suppose there is a non-database text item called :myfilename
:myfilename := 'C:\SomeFolder\SomePath\myfile.doc';
I would like to get the file name only without the full path,
i.e. myfile.doc
and the file extension, i.e. 'doc', 'bat', 'java', 'xhtml' etc., i.e. the last few chars from the right to the period.
Any help is welcome.

Thanks for the hints.
I defined the non-database Text Item called FULLFILENAME and another two text items called FILE_NAME, FILE_EXTENSION. The following can extract the file extension,
select substr(:FULLFILENAME,instr(:FULLFILENAME,'.')+1) into :FILE_EXTENSION from dual;
e.g.
:FULLFILENAME := 'C:\MyFolder\AnotherFolder\file.doc';
FILE_EXTENSION becomes 'doc'
but I would also like to extract only the filename without path into FILE_NAME,
i.e. file.doc
Please give more hints. Thanks.

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How to get only the filename and extension for a text item?

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