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The previous coding was correct, but the style and commentary were a bit vague about which operations had to happen, in what circumstances, and in what order. Rearrange so that the epilogue does nothing in the DFA END state. That allows turning some conditional statements in the backtracking logic into asserts. With that, we can be more explicit about needing to backtrack at least one byte in non-END states to ensure checking the current byte sequence in the slow path. No change to the regression tests, since they should be able catch deficiencies here already. In passing, improve the comments around DFA states where the first continuation byte has a restricted range.
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/.