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st: regular expressions in Stata


From   scott hankins <scott.hankins@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: regular expressions in Stata
Date   Tue, 13 Sep 2005 13:34:29 -0400

Hello

I am trying to use the new regex functions and am having some issues.

I am familiar (but not an expert) with regular expressions in Perl and
I am problems applying that knowledge in Stata. Does anyone know how
regular expressions are implemented in Stata? Ideally, I would like
more than "Regular expression syntax is based on Henry Spencer's NFA
algorithm and as such, is nearly identical to the POSIX.2 standard."
as I have not been able to find a clear exposition of the POSIX.2
standard online (I am sure there is one, I just can't find it :) ).


***********************************
here is my problem

pdx
76403
76403
76513
76503


I tried the following code but it did not find any matches, this
should find all 4 of the above occurrences.

replace weight = 3 if regexm(pdx,"V76(4|5).3")
***********************************

thanks in advance

scott

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