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doc: Correct jsonpath string literal escapes description 

The paragraph describing the JavaScript string literals allowed in
jsonpath expressions unnecessarily mentions JSON by erroneously
listing \v as allowed by JSON and mentioning the \xNN and \u{N...}
backslash escapes as deviations from JSON when in fact both are
accepted by ECMAScript/JavaScript.  Fix this by only referring to
JavaScript.

Author: Erik Wienhold <ewie@ewie.name>
Discussion: https://www.postgresql.org/message-id/flat/1EB17DF9-2636-484B-9DD0-3CAB19C4F5C4@justatheory.com
This commit is contained in:
Peter Eisentraut 2024-04-24 11:31:47 +02:00
parent 3886530caa
commit b279e37015
1 changed files with 7 additions and 8 deletions
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15
doc/src/sgml/json.sgml
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@ -803,21 +803,20 @@ UPDATE table_name SET jsonb_field[1]['a'] = '1';
In particular, the way to write a double quote within an embedded string
literal is <literal>\"</literal>, and to write a backslash itself, you
must write <literal>\\</literal>. Other special backslash sequences
include those recognized in JSON strings:
include those recognized in JavaScript strings:
<literal>\b</literal>,
<literal>\f</literal>,
<literal>\n</literal>,
<literal>\r</literal>,
<literal>\t</literal>,
<literal>\v</literal>
for various ASCII control characters, and
<literal>\u<replaceable>NNNN</replaceable></literal> for a Unicode
character identified by its 4-hex-digit code point. The backslash
syntax also includes two cases not allowed by JSON:
for various ASCII control characters,
<literal>\x<replaceable>NN</replaceable></literal> for a character code
written with only two hex digits, and
<literal>\u{<replaceable>N...</replaceable>}</literal> for a character
code written with 1 to 6 hex digits.
written with only two hex digits,
<literal>\u<replaceable>NNNN</replaceable></literal> for a Unicode
character identified by its 4-hex-digit code point, and
<literal>\u{<replaceable>N...</replaceable>}</literal> for a Unicode
character code point written with 1 to 6 hex digits.
</para>
<para>