每一个映射表达了数据源结构的目标结构的建立规则。
Each mapping expresses the rule of creation of target structure from the source structure.
为了表达这一点，我们需要编写一个解析规则，也称作产生式。
To express this, we need to write a parsing rule, also known as a production.
如何在Drools规则文件中表达这一点呢？
而对于这里所说的逻辑，最好的表达方式是规则。
每个规则定义含有一个可选描述、变量列表和一个表达式。
Each rule definition contains an optional description, a list of variables, and an expression.
每一个规则都有相应的当正则表达式得到匹配时去执行的代码。
Each rule has corresponding code that is executed when the regular expression is matched.
在以后的规则表达式讨论中会进一步说明这个话题。
This is further explained in a later discussion of regular expressions.
可以使用规则表达式来表示可能会在文本中发现的模式。
We can use regular expressions to express patterns that we may find in the text.
规则表达式地址总是由斜杠括起。
Regular expression addresses are always surrounded by slashes.
规则表达式搜索虽然能完成相同的搜索，但更简单的系统也能做到。
Regular expression searches can certainly do this, but so can some simpler systems.
规则表达式很复杂。
为这个规则指定正则表达式模式。
创建规则文件和匹配位置和面积的正则表达式。
Creating a rule file with regular expressions for location and area.
在这个特别的规则表达式中，出现了' [[：space：]] '字符类。
In this particular regular expression, we encounter the '[[: space:]]' character class.
规则表达式搜索满足(尽可能复杂)的模式。
Regular expression searches match on (possibly complex) patterns.
基于搜索字符串寻找结果或者规则表达式。
Search for a finding based on a search string, or a regular expression.
在规则表达式中，方括号只表示“查找与方括号中任何字符的匹配字符”。
In regular expressions, square brackets just mean "match any character in the brackets."
它将具有灵活的(可能的基于规则表达式)搜索和替换能力。
It will have flexible (maybe regular-expression based) search and replace capabilities.
确定采用产生式规则即“IF - THEN”语句表达专家知识。
We decided to adopt "IF-THEN" phrase to express expert knowledge.
规则7：你出于忠诚表达异议，可以将你所在的机构带向正确的方向。
Rule7: Your loyal dissent can lead your institution in the right direction.
又由于饶舌乐并没有乐理规则，所以让歌手们有无限的自由可以表达自我。
Because it had no rules, rap offered them limitless freedom to express themselves.
它们突破了正常的语法结构规则，在特定语境中产生积极的表达效果。
They have broken the regular grammar rules, and have an active effect in special contexts.
该方法通过建立数学规则库，对两个数学表达式进行树型模式匹配和算式变换来实现。
This approach is implemented by rule set building, tree pattern matching and math expression transformation.
否则，你需要为每一种情况下写不同的规则或正则表达式。
Otherwise, you need to write different rules or regular expressions for each case.
否则，你需要为每一种情况下写不同的规则或正则表达式。
Otherwise, you need to write different rules or regular expressions for each case.
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