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php - Regex - Remove all matches leaving the last

I need a regex to remove dots in an number but just leaving the last. Example:

12312.123132.12312.131.3131.3123.13123.1231

to

12312123132123121313131312313123.1231

I tried some expressions but none worked.

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In addition to the other answers, here is one more

[.](?!d*$)
or
[.](?![^.]*$)


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