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Re: st: Extracting substrings from variables.


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Extracting substrings from variables.
Date   Fri, 25 May 2012 13:07:57 +0100

On Fri, May 25 2012, Brendan Halpin wrote:

> On Fri, May 25 2012, Amal Khanolkar wrote:
>
>> gen preght = regexs(0) if regexm(mdiag1x, "[^637] | [^642] | [^O1]")
>
> A quick and untested suggestion:
>
> . gen preght = regexs(0) if regexm(mdiag1x, "^(637)|(642)|(O1)")

On testing, it seems the grouping parentheses are not necessary:

...................................................................
. input str10 mdiag1x

        mdiag1x
  1.    "637 asdf"
  2.    "638 asdf"
  3.    "8637 asdf"
  4.    "642 asdf"
  5.    "O1 asdf"
  6. end

. gen preght = regexs(0) if regexm(mdiag1x, "^637|642|O1")
(2 missing values generated)

. gen hasdiag = regexm(mdiag1x, "^637|642|O1")

. list

     +------------------------------+
     |   mdiag1x   preght   hasdiag |
     |------------------------------|
  1. |  637 asdf      637         1 |
  2. |  638 asdf                  0 |
  3. | 8637 asdf                  0 |
  4. |  642 asdf      642         1 |
  5. |   O1 asdf       O1         1 |
     +------------------------------+
...................................................................

Brendan
-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
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http://teaching.sociology.ul.ie/bhalpin/wordpress         twitter:@ULSociology
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