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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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SUBSTITUTE(text, old, new [,num])
SUBSTITUTE replaces @old with @new in @text. Substitutions are only applied to instance @num of @old in @text, otherwise every one is changed.
This function is Excel compatible.
SUBSTITUTE("testing","test","wait") equals "waiting".
REPLACE, TRIM.
