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st: Substring problem


From   Alberto R Osella <arosella@irccsdebellis.it>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Substring problem
Date   Mon, 04 Mar 2013 14:38:23 +0100

My data look like this.
                                      A B               C

  1. | Latte di vacca parzial. scremato    200 g     (92 kcal)
  2. |                  Caffe' in tazza                   30 g (0 kcal)
3. | Sogliola 150 g (124 kcal)
  4. |      Olio di oliva extra vergine          15 g    (134 kcal)
  5. |                 Cicoria di campo            200 g     (20 kcal)

These are three strinf variables coming from a software. I need to transform the last two string variables into numeric ones but
I need only a substring of them ( not 200 g but 200, not (92 kcal) but 92.
I've tried  but I was not able to find a solution.
I'm using Stata 12.1 on W7.
Can anyone to help me?
Thanks in advance

--
Alberto R. Osella, MD, PhD
Laboratorio di Epidemiologia e Biostatistica
IRCCS Saverio de Bellis
Via Turi, 27
70013 Castellana Grotte (BA)
Italia
Tel:    +39 0804994655
Fax:    +39 0804994650
e-mail: arosella@irccsdebellis.it

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