Description: ------------ The Postalcodes should be validated on first letter against A-Z as they use new region codes. $regexp = $casesens ? '/^[A-Z]\d{4}([A-Z]{3})?$/' : '/^[A-Z]\d{4}([A-Z]{3})?$/i';

Got a link to some docs or similar?

System described (Spanish): http://www.correoargentino.com.ar/consulta_cpa/home.php Last ISO-3166 change: http://www.iso.org/iso/iso_3166-2_newsletter_ii-2_2010-06-30.pdf Wikipedia entry for postal code system: http://en.wikipedia.org/wiki/Postal_codes_in_Argentina A => Salta Z => Santa Cruz By rereading the ISO change, it seems the implementation is false since beginning. As Salta and Santa Cruz existet before.

That's wrong. it needs to allow the following: - just 4 numbers: 1229 - one letter + 4 numbers - C1229 - one letter, 4 numbers, 3 letters blockcode - C1229ABF

This bug has been fixed in SVN. If this was a documentation problem, the fix will appear on pear.php.net by the end of next Sunday (CET). If this was a problem with the pear.php.net website, the change should be live shortly. Otherwise, the fix will appear in the package's next release. Thank you for the report and for helping us make PEAR better.