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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def from_name_re(cls, path:PathOrStr, fnames:FilePathList, pat:str, valid_pct:float=0.2, **kwargs):
        "Create from list of `fnames` in `path` with re expression `pat`."
        pat = re.compile(pat)
        def _get_label(fn):
            if isinstance(fn, Path): fn = fn.as_posix()
            res = pat.search(str(fn))
            assert res,f'Failed to find "{pat}" in "{fn}"'
            return res.group(1)
        return cls.from_name_func(path, fnames, _get_label, valid_pct=valid_pct, **kwargs)