def include_pattern(self, pattern, anchor=1, prefix=None, is_regex=0):
        """Select strings (presumably filenames) from 'self.files' that
        match 'pattern', a Unix-style wildcard (glob) pattern.  Patterns
        are not quite the same as implemented by the 'fnmatch' module: '*'
        and '?'  match non-special characters, where "special" is platform-
        dependent: slash on Unix; colon, slash, and backslash on
        DOS/Windows; and colon on Mac OS.

        If 'anchor' is true (the default), then the pattern match is more
        stringent: "*.py" will match "foo.py" but not "foo/bar.py".  If
        'anchor' is false, both of these will match.

        If 'prefix' is supplied, then only filenames starting with 'prefix'
        (itself a pattern) and ending with 'pattern', with anything in between
        them, will match.  'anchor' is ignored in this case.

        If 'is_regex' is true, 'anchor' and 'prefix' are ignored, and
        'pattern' is assumed to be either a string containing a regex or a
        regex object -- no translation is done, the regex is just compiled
        and used as-is.

        Selected strings will be added to self.files.

        Return True if files are found, False otherwise.
        """
        # XXX docstring lying about what the special chars are?
        files_found = False
        pattern_re = translate_pattern(pattern, anchor, prefix, is_regex)
        self.debug_print("include_pattern: applying regex r'%s'" % pattern_re.pattern)

        # delayed loading of allfiles list
        if self.allfiles is None:
            self.findall()

        for name in self.allfiles:
            if pattern_re.search(name):
                self.debug_print(" adding " + name)
                self.files.append(name)
                files_found = True
        return files_found
Select strings (presumably filenames) from 'self.files' that
        match 'pattern', a Unix-style wildcard (glob) pattern.  Patterns
        are not quite the same as implemented by the 'fnmatch' module: '*'
        and '?'  match non-special characters, where "special" is platform-
        dependent: slash on Unix; colon, slash, and backslash on
        DOS/Windows; and colon on Mac OS.

        If 'anchor' is true (the default), then the pattern match is more
        stringent: "*.py" will match "foo.py" but not "foo/bar.py".  If
        'anchor' is false, both of these will match.

        If 'prefix' is supplied, then only filenames starting with 'prefix'
        (itself a pattern) and ending with 'pattern', with anything in between
        them, will match.  'anchor' is ignored in this case.

        If 'is_regex' is true, 'anchor' and 'prefix' are ignored, and
        'pattern' is assumed to be either a string containing a regex or a
        regex object -- no translation is done, the regex is just compiled
        and used as-is.

        Selected strings will be added to self.files.

        Return True if files are found, False otherwise.
        
product/gradle-plugin/src/main/python/setuptools/_distutils/filelist.py