.../Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/ 可以检测到"Win 9x ...
/Win(?:dows )?[^do]{2}\s?\d+\.\d+/ 可以检测到"Win 9x 4.90"
/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/ 可以检测到"Win 9x 4.9...
...学习--01】--正则表达式的正则前瞻(?=)和非捕获性分组(?:)区别...
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