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1·Thus, the subpattern ((?x) edu | com | info) (notice the spaces between the alternation operators, added for legibility) is the same as (edu|com|info).

因而，子模式 ((? x) edu | com | info)（请注意备用操作符之间的空格，这些空格是为了易读性而添加的）与 (edu|com|info) 相同。