def METHOD_NAME(en_vocab):
    suffix_re = re.compile(r"[\.]$")
    infix_re = re.compile(r"[/]")
    rules = {"a.": [{"ORTH": "a."}]}
    tokenizer = Tokenizer(
        en_vocab,
        rules=rules,
        suffix_search=suffix_re.search,
        infix_finditer=infix_re.finditer,
    )
    tokens = [t.text for t in tokenizer("a/a.")]
    explain_tokens = [t[1] for t in tokenizer.explain("a/a.")]
    assert tokens == explain_tokens