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Re: st: how to count the number of certain characters in a string variable?


From   Scott Merryman <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: how to count the number of certain characters in a string variable?
Date   Tue, 28 Jul 2009 09:18:29 -0500

I assume by your example you mean "aa" and "a".  One way would be

-gen y = regexm(x, "aa") + regexm(x, "a")-

To relace:

-gen x2 =   regexr(x,"aa" ,"zz")-
-replace x2 =   regexr(x2,"a" ,"z")-


Scott

2009/7/28  <gjhxmu@sina.com>:
> Dear statalists,
>
> I have a string variable X as follows:
>
> X                Y
>
> aabb            2
>
> bbdd            0
>
> cdba            1
>
> dxbaa          2
>
> dxaa            2
>
> I want to generate a variable Y to stand for the number of certain characters,
> such as "aa" and replace these characters with other characters, such as "zz".
>
>
> How to do it ?
>
> Thank you !
>
> Sincerely,
>
> From Rose.
>

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