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stripping out digits from a string with sed

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# 1  
Old 06-10-2010
stripping out digits from a string with sed
i want to parse a string and only display the digits in that string... How would i accomplish this with sed command.

For example.
input string: " 033434343 dafasdf"
output string: 03343434


Thanks
# 2  
Old 06-10-2010
Code:
echo " 033434343 dafasdf" | sed "s/[^0-9]//g"

# 3  
Old 06-10-2010
Thanks!
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