Re: \W excludes underscore
"David G. Johnston" <[email protected]>
| Newsgroups | gmane.comp.db.postgresql.devel.documentation |
|---|---|
| Message-ID | <CAKFQuwYzpnir33sqCScp-b=mSODm-65s=EMrDrUXKTMY54QCjA@mail.gmail.com> |
On Tue, May 7, 2019 at 4:36 PM Erwin Brandstetter <[email protected]> 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.