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Searching for unknown date inside the file and replace to new date

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# 1  
Old 10-11-2012
Searching for unknown date inside the file and replace to new date
Hello,

Iam a newbies to Shell scripting. Iam trying to replace the date inside the file to new date. is there anyway that we can just use the pattern to search as "[0-9]..." I have many files want to replace with the same date, and each file contains different date.

Thanks for your help.

~Daro
# 2  
Old 10-11-2012
Please post a sample of the input file and the expected output.
And use code tags while posting code and data samples.
# 3  
Old 10-11-2012
Thanks for a quick response.
ex: file.txt
Today is 2012-10-04.

and I would like to change the date inside the file "2012-10-04" to new date. I know how to replace it as "s/olddate/newdate/", this way I need to get into the file to get the old date that I would like to change. But this ways takes time since I have many files and each file contains different date.
Please help me to use "pattern" instead.

Thanks.

Daro
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