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。
Each nested set of parentheses, counting from the left, incrementing at each left parenthesis is placed in the next special, numerical variable. For example.
每个嵌套的括号对，从左开始算起，每个左圆括号加一，放在下一个特殊的数字变量中。
Each nested set of parentheses, counting from the left, incrementing at each left parenthesis is placed in the next special, numerical variable. For example.
每个嵌套的括号对，从左开始算起，每个左圆括号加一，放在下一个特殊的数字变量中。
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