Do you just want to replace all digits in a string with # ? If so, try 
s/\d/\#/g;

[download]
This turns 1234.5 into ####.#.

If this is not what you want to do, please explain in more detail.

In reply to Re: Replacing numbers using regular expression by Thilosophy
in thread Replacing numbers using regular expression by agynr

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