| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | pgsql-bugs(at)lists(dot)postgresql(dot)org, koglep(at)gmail(dot)com |
| Subject: | Re: BUG #15069: group by after regexp_replace |
| Date: | 2018-02-15 15:34:59 |
| Message-ID: | 87fu62qngv.fsf@news-spur.riddles.org.uk |
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| Thread: | |
| Lists: | pgsql-bugs |
>>>>> "PG" == PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
PG> select upper(regexp_replace(a, '\\s+', '')) as keyword
This regexp doesn't do what you seem to be expecting. With
standard_conforming_strings enabled, which is the default, \ is not a
special character to the string literal parser, so the regexp engine is
seeing a regexp of \\s+ which means "match the literal character \
followed by one or more lowercase "s" characters". Accordingly the
regexp never matches on your input.
To remove whitespace use '\s+' or E'\\s+' or '[[:space:]]+'
--
Andrew (irc:RhodiumToad)
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