通过使用RegularExpressionlookup操作器，可以找到与所选规则文件中包含的表达式匹配的文本部分。
With the Regular expression Lookup operator you can find the text sections that match the expressions contained in the selected rule files.
向下滚动已注册用户部分，可以找到一组匹配您所使用的Snort版本的规则集；图1显示了这部分 Snort站点。
Scroll down to the registered user section, where you can get a set of rules to match the release of Snort you're using; this portion of the Snort site is shown in Figure 1.
iptables命令的可选match部分指定信息包与规则匹配所应具有的特征（如源和目的地地址、协议等）。
The optional match section of the iptables command specifies the characteristics that a packet should have to match the rule, such as source and destination address, protocol, etc.
Matched框就会显示规则中与Inputtext 框中的文本匹配的部分。
The Matched field then shows the parts of the rule that could be matched to the text in the Input text field.
可以看到，样式表规则使用ID、类和元素选择器匹配清单1的各部分内容。
You can see the rules using ID, class, and element selectors matching parts of Listing 1.
当定义了所有规则之后，它们与转换的一部分相匹配，它们用ExtendTransform元素对该转换做出贡献。
After all of the rules have been defined, they are matched with the part of the transformation that they will contribute to with ExtendTransform elements.
在第1部分的图13可以看到，cn属性类型有一个叫做SUBSTR的字段，它定义了子字符串匹配的匹配规则。
You saw in Part 1, Figure 13 that the cn attribute type has a field called substr, which defines the matching rules for substring match.
当我们编写基于sysfs信息的规则时，只是简单的匹配链条上一部分文件的属性内容。
When you write rules based on sysfs information, you are simply matching attribute contents of some files in one part of the chain. For example, I can read the size of my hard disk as follows.
当我们编写基于sysfs信息的规则时，只是简单的匹配链条上一部分文件的属性内容。
When you write rules based on sysfs information, you are simply matching attribute contents of some files in one part of the chain. For example, I can read the size of my hard disk as follows.
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