Search and replace regular expression in Open Office calc

I've got something like this (in Open Office Calc):

Streetname. Number
Streetname. Number a

etc. Now I want to delete everything in front of the number. So I need to do a search and replace I guess. ^.*?([0-9]) this one matches Streetname. Number .. but what should I put in the replace field? If I do the search and replace, it deletes e开发者_如何学JAVAverything within the datafield :(

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In Search for field, write the following regex: (.*?[:space:])([0-9]+)

And in Replace with, write: $2

That means that you search for:

1. any characters followed by a space
2. one or more digits.

Replace all that with $2 - the reference to the digits.

It will replace Streetname. Number 24 with 24. Why did you put a in your example?