Find and replace text in multiple files

Is there a lisp routine or small program which can find and replace text strings in multiple files? We are transferring our drawings to a different
material designation standard so I shuold change strings in bill of materials tables (hopefully not manually).
Thanks.
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HiHo; Go to Cadalyst, http://new.cadalyst.com/code/tips/CodeSearch_Advanced.cfm and search for Text,(Find).

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