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Clarify documentation for the initcap function

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This commit documents differences in the definition of word separators for
the initcap function between libc and ICU locale providers.
Backpatch to all supported branches.

Discussion: https://postgr.es/m/804cc10ef95d4d3b298e76b181fd9437%40postgrespro.ru
Author: Oleg Tselebrovskiy <o.tselebrovskiy@postgrespro.ru>
Backpatch-through: 13
This commit is contained in:
Alexander Korotkov
2025-07-29 10:41:13 +03:00
parent fd4ad33fe2
commit 3c05d4d343
1 changed files with 5 additions and 2 deletions
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7
doc/src/sgml/func.sgml
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@ -3110,8 +3110,11 @@ SELECT NOT(ROW(table.*) IS NOT NULL) FROM TABLE; -- detect at least one null in
</para>
<para>
Converts the first letter of each word to upper case and the
rest to lower case. Words are sequences of alphanumeric
characters separated by non-alphanumeric characters.
rest to lower case. When using the <literal>libc</literal> locale
provider, words are sequences of alphanumeric characters separated
by non-alphanumeric characters; when using the ICU locale provider,
words are separated according to
<ulink url="https://www.unicode.org/reports/tr29/#Word_Boundaries">Unicode Standard Annex #29</ulink>.
</para>
<para>
<literal>initcap('hi THOMAS')</literal>