On Tue, May 7, 2019 at 4:36 PM Erwin Brandstetter <brsaw...@gmail.com> wrote:
> > https://www.postgresql.org/docs/current/functions-matching.html#POSIX-CLASS-SHORTHAND-ESCAPES-TABLE > Table 9.19. Regular Expression Class-shorthand Escape: > > > \w [[:alnum:]_] (note underscore is included) > > ... > > \W [^[:alnum:]_] (note underscore is included) > > This is misleading as \w *includes* underscore, but \W *excludes* it. I > suggest: > Its saying that the underscore is one of the characters that is included in the exclusion, alongside the alphabetical characters. > \w [[:alnum:]_] (underscore is included) > ... > \W [^[:alnum:]_] (underscore is excluded) > > Or just "note the underscore" The reader is already assumed to know that the capital letters and the leading ^ in the bracket denote exclusion since its doesn't call out that specifically. David J.
