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Provide some documentation about the differences between XQuery regular expressions and those supported by Spencer's regex engine. Since SQL now exposes XQuery regexps with the LIKE_REGEX operator, I made this a standalone section designed to help somebody who has to translate a LIKE_REGEX query to Postgres. (Eventually we might extend Spencer's engine to allow precise implementation of XQuery, but not today.) Reference that in the jsonpath docs, provide definitions of the XQuery flag letters, and add a description of the JavaScript-inspired string literal syntax used within jsonpath. Also point out explicitly that backslashes used within like_regex patterns will need to be doubled. This also syncs the docs with the decision implemented in commit d5b90cd64 to desupport XQuery's 'x' flag for now. Jonathan Katz and Tom Lane Discussion: https://postgr.es/m/CAPpHfdvDci4iqNF9fhRkTqhe-5_8HmzeLt56drH%2B_Rv2rNRqfg@mail.gmail.com
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/.