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st: retrieving a three-letter word from a string variable

From   "Dev Vencappa" <>
To   <>
Subject   st: retrieving a three-letter word from a string variable
Date   Fri, 28 May 2004 15:52:19 +0100

Dear users,

 I have a dataset that contains several string variables. Suppose one string variable contains the following values in one of the observations:


Another string variable contains :


I want stata to create a new variable that retrieves only the three-letter word "HMV" from the string variable. I understand that the substr command does that but because the starting point of the word HMV is not the same for every variable , it would be difficult to identify the correct starting position to read the string and retrieve the first three letters HMV. 
Can somebody help please? I have tried the other string commands but could not understand one that does what I want.

Many thanks

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