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st: Need help with regular expression

From   Michael Stewart <>
To   statalist <>
Subject   st: Need help with regular expression
Date   Sun, 17 Feb 2013 02:15:06 -0500

HI ,

I am trying to use regexm command (regexm(var,"us"))to see if the
values of variable have a particular string "us" like in  "us thyroid"
.Unfortunately , it is picking up "us" from other string values like
"venous".If there a way to formulate command so that it can pick up
only values  where "us" is a separate word and not part of word like

Thank you ,
Yours Sincerely,
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