How to replace partial string

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# 1  
Old 08-04-2011
How to replace partial string

I have a list of strings in file:
10 10 AAA
120 13 BBBBB
23 11 CCCCC
11 32 DDDDDD

I want to replace first column of the text such as: 10, 129, 23, 11 with 11, 22, 33, 44.
I can do line by line, but just not sure how to replace partial string without losing those spaces.
Any suggestions would be appreciated.
# 2  
Old 08-04-2011

Try next 'perl' command:
$ perl -pe 's/^\d+/11*++$i/e' infile
11 10 AAA
22 13 BBBBB
33 11 CCCCC
44 32 DDDDDD

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