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    print strf( $format, %data );
    print strf( $format, \%data );

The C<strf> function returns a string representing hash-data as string in specified C<$format>.
This function is somewhat similar to the C function strftime(), except that the data source
is not the date and time, but the set of data passed to the function.

The format string may be containing any combination of regular characters and special format
specifiers (patterns). These patterns are replaced to the corresponding values to represent
the data passed as  second function argument. They all begin with a percentage (%) sign,
and are: '%c' or '%{word}'. The "c" is single character specifier like %d, the "word" is
regular word like "month" or "filename"

If you give a pattern that doesn't exist, then it is simply treated as text.
If you give a pattern that doesn't defined but is exist in data set, then it will be
replaced to empty text string ('')

B<Please note!> All patterns C<'%%'> will be replaced to literal C<'%'> character if you not
redefinet this pattern in Your data set manually