For starters, anchor your regex, for two reasons: efficiency, and you prevent a match to happen by the regex engine starting to match at the second group. 
/^(\d+.\d+\.(\d{2,}|[4-9])\.\d+)/

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Abigail

In reply to Re: Question about conditional regex capture by Abigail-II
in thread Question about conditional regex capture by TASdvlper

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