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Tom Lane ca8217c101 Add a test module for the regular expression package.
This module provides a function test_regex() that is functionally
rather like regexp_matches(), but with additional debugging-oriented
options and additional output.  The debug options are somewhat obscure;
they are chosen to match the API of the test harness that Henry Spencer
wrote way-back-when for use in Tcl.  With this, we can import all the
test cases that Spencer wrote originally, even for regex functionality
that we don't currently expose in Postgres.  This seems necessary
because we can no longer rely on Tcl to act as upstream and verify
any fixes or improvements that we make.

In addition to Spencer's tests, I added a few for lookbehind
constraints (which we added in 2015, and Tcl still hasn't absorbed)
that are modeled on his tests for lookahead constraints.  After looking
at code coverage reports, I also threw in a couple of tests to more
fully exercise our "high colormap" logic.

According to my testing, this brings the check-world coverage
for src/backend/regex/ from 71.1% to 86.7% of lines.
(coverage.postgresql.org shows a slightly different number,
which I think is because it measures a non-assert build.)

Discussion: https://postgr.es/m/2873268.1609732164@sss.pgh.pa.us
2021-01-06 10:51:14 -05:00
config Update copyright for 2021 2021-01-02 13:06:25 -05:00
contrib Test decoding of two-phase transactions during the build of a consistent snapshot. 2021-01-05 15:05:22 +05:30
doc Replace CLOBBER_CACHE_ALWAYS with run-time GUC 2021-01-06 10:46:44 +01:00
src Add a test module for the regular expression package. 2021-01-06 10:51:14 -05:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
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README

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/.