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New IS&#95;UPLOAD&#95;FILENAME validator checks if name and extension of file uploaded through file input matches given criteria.

Note that this does *not* ensure the file type in any way. String is partitioned into name and extension parts by splitting it with dot character.

INPUT(_type='file', _name='name', requires=IS_UPLOAD_FILENAME(filename=None,
                                                                  extension=None,
                                                                  lastdot=True,
                                                                  case=1))

1. filename: filename (before dot) regular expression text
2. extension: extension (after dot) regular expression text
3. lastdot: which dot should be used as a filename / extension separator:
            True means last dot, eg. file.png -> file / png,
            False means first dot, eg. file.tar.gz -> file / tar.gz
4. case: 0 - keep the case, 1 - transform the string into lowercase (default),
         2 - transform the string into uppercase

If there is no dot present, extension checks will be done against empty string and filename checks against whole value.

Examples:

Check if file has a pdf extension (case insensitive):

INPUT(_type='file', _name='name', requires=IS_FILENAME(extension='pdf'))

Check if file has a tar.gz extension and name starting with backup:

INPUT(_type='file', _name='name', requires=IS_FILENAME(filename='backup.*',
                                                           extension='tar\.gz',
                                                           lastdot=False))

Check if file has no extension and name matching README (case sensitive):

INPUT(_type='file', _name='name', requires=IS_FILENAME(filename='^README$',
                                                           extension='^$',
                                                           case=0))

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