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st: special characters for regex


From   László Sándor <[email protected]>
To   [email protected]
Subject   st: special characters for regex
Date   Thu, 29 Aug 2013 18:08:47 -0400

I burnt myself with these, I regret my incomplete testing. So, for
others to know:

Though Stata help says "Regular expression syntax is based on Henry
Spencer's NFA algorithm, and this is nearly (sic!) identical to the
POSIX.2 standard." the POSIX.2 standard for special characters (like
[:digit:] for \d or [:space:] for \s, or either with double
bracketing) does not work. Worse, they don't produce an error, just
assume they want to look for the characters between the brackets, and
for some reason you listed colons twice.

There seems to be no substitute but to use listing between brackets. Sigh.
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