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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: Replace whole words?
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dum dee dee dum <xjkljasdfi@yahoo.org> writes:

> I have written a fairly long program, but I now want to find and
> replace all the 'int' s in the program to double as easily as
> possible. But I don't want the other words, variable names, etc. in
> the program that have 'int' in them (internationalization, for
> example) to change. Any ideas? M-% is an option, but I have to say
> yes or no for each word it finds to make sure that parts of words
> don't get replaced - I want to do this in just one command if
> possible.

You can replace by using a regular expression -- use `C-M-%'. 

"\<" matches the beginning of a word, and "\>" matches the end of a
word.  So "\<int\>" is the string you want to search for.