regular expression for list

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regular-expression

I want a regular xpression for list of statement as suppose
i have following list of statement in numbering

1 . helllo this is first sentence.
2 . hello this is second one . here it is in the second one.
3 . hello this is third one .
4 . hello this is the forth nd last.

so need to have regular expression for the same it detect the dot . between sentence