I am trying to substitute all my mail addresses in on my html pages from this: 
@mail.ab.com

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To this: 
_n@mail.ab.com

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So if there was an email address of smith@mail.ab.com then it would be smith_n@mail.ab.com. I tried: 
s/\@mail.ab.com/_n\@mail.ab.com/gi;

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The result is most of the time it changes it to: 
smith_n_n_n_n_n_n@mail.ab.com

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Please help.

In reply to Substitute problem by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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