. htaccess inside the regular related questions

. htaccess inside regular problem, online etc.
Rewriterule ^ ([a-za-z]+$)/| ([1-9]\d*). HTML test/cata/index.php?id=$2
Rewriterule ^ ([a-za-z]+)/($) test/cata/index.php?entrance=$1

How to exclude a word like "book" and "Class" in regular [a-za-z]+$]
Equivalent when I visit http://localhost/test/abcdefg/13.html can
But when I visit http://localhost/test/book/13.html, I can not

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I don't know if I can use the "back reference" + "0 wide assertion" with regular expressions, I think I should be able to implement
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One more statement.
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Rewrite supports negative 0 wide assertion
(?! Exp
(? One is the first, the other is after the hair
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Make a list of the valid words, as follows:
(arr|unset|function) \.html
This will only match arr.html;unset.html;function.html.

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