How to extract Numbers

Hi all,
I've a string like this

AAAxx.yy
where AAA are letters and xx and yy are numbers. I want to extract xx.yy 
from the string. I'm doing some thing like this.

echo abc12.34 | sed -e 's|^\D*\(\d.*\)|\1|g'

but the result i'm getting is abc12.34 only. Where am i doing wrong ?

Thx in advance,
Surya









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