这个规则包含两个子模式（即匹配组），它们包围在圆括号中。
The rule contains two subpatterns, or match groups, enclosed by parenthesis.
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.
本研究以初始购买动机为协变量，探讨调节性匹配组与不匹配组在重复购买动机上的差异。
Taking the initial purchase motive as the covariance, this research discusses the difference in the repurchase motive between the fit group and the not-fit group.
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