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Define the meanings of the POSIX-spec character classes in line, rather than referring to the ctype(3) man page. That man page doesn't even exist on many modern systems, and if it does exist it probably says the wrong things about non-ASCII characters. Also document our non-POSIX-spec "ascii" character class. Also, point out here that this behavior is controlled by collation or LC_CTYPE, since the existing text explaining that is pretty far away. Per gripe from Geert Lobbestael. Given the lack of prior complaints, I'm not excited about back-patching this. Discussion: https://postgr.es/m/155837022049.1359.2948065118562813468@wrigleys.postgresql.org
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.