这种语法转换器会遍历每条规则，并试图查找一个匹配的模式。
The syntax transformer will go through each rule and try to find a matching pattern.
RETURN ： 在规则中设置的 RETURN 目标让与该规则匹配的信息包停止遍历包含该规则的链。
RETURN: The RETURN target set in a rule makes the packet matching that rule stop traversing through the chain containing the rule.
然后，它将遍历重写规则，每次遍历一个，对于每个规则，它将获取规则的LookFor属性，并使用正则表达式来确定是否在被请求的URL中找到了匹配的规则。
It then iterates through the rewrite rules one at a time, and for each rule, it grabs its LookFor property and USES a regular expression to determine if a match is found in the requested URL.
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