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

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http://www.unix.com – 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 (HowTos)