Re: \W excludes underscore
| От | David G. Johnston |
|---|---|
| Тема | Re: \W excludes underscore |
| Дата | |
| Msg-id | CAKFQuwYzpnir33sqCScp-b=mSODm-65s=EMrDrUXKTMY54QCjA@mail.gmail.com обсуждение исходный текст |
| Ответ на | \W excludes underscore (Erwin Brandstetter <brsaweda@gmail.com>) |
| Список | pgsql-docs |
On Tue, May 7, 2019 at 4:36 PM Erwin Brandstetter <brsaweda@gmail.com> wrote:
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.
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