The parenthesis around each digit grouping is vital-it allows us to refer to the matched characters inside those parentheses in the corresponding property.
每个数字组周围的括号非常重要，通过它可以在相应的属性中引用这些括号内的匹配字符。
The parenthesis around each digit grouping is vital-it allows us to refer to the matched characters inside those parentheses in the corresponding property.
每个数字组周围的括号非常重要，通过它可以在相应的属性中引用这些括号内的匹配字符。
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