通过把正则表达式规则的子模式(匹配组)分配给特性，可以设置注解的特性值。

You can set the feature values of an annotation by assigning a sub-pattern of the regular expression rule-a match group-to the feature.

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该模式是一个正则表达式，它表示可接受的store ID的值应该以ID开头，后面紧跟着六位数字。

This pattern is a regular expression that means the acceptable value of store ID should begin with ID followed by six digits.

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yacc可以识别出记号的模式；例如，如上面例子中所示，它可以识别出一个表达式可能由一个值、一个加号或者减号以及另一个值构成。

Yacc can recognize patterns of tokens; for instance, as in the example above, it can recognize that an expression can consist of a value, either a plus or minus sign, and another value.

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