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Improve documentation example for jsonpath like_regex operator 

Make sample like_regex match string values of the root object instead of the
whole document.  The corrected example seems to represent a more relevant
use case.

Backpatch to 12, when jsonpath was introduced.

Discussion: https://postgr.es/m/13440f8b-4c1f-5875-c8e3-f3f65606af2f%40xs4all.nl
Author: Erik Rijkers
Reviewed-by: Michael Paquier, Alexander Korotkov
Backpatch-through: 12
This commit is contained in:
Alexander Korotkov 2021-05-13 16:10:21 +03:00
parent a784859f44
commit 9b7286c2b3
1 changed files with 3 additions and 2 deletions
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doc/src/sgml/func.sgml
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@ -17130,9 +17130,10 @@ $[*] ? (@ like_regex "^[aeiou]" flag "i")
is a JSON path string literal, written according to the rules given in
<xref linkend="datatype-jsonpath"/>. This means in particular that any
backslashes you want to use in the regular expression must be doubled.
For example, to match strings that contain only digits:
For example, to match string values of the root document that contain
only digits:
<programlisting>
$ ? (@ like_regex "^\\d+$")
$.* ? (@ like_regex "^\\d+$")
</programlisting>
</para>
</sect3>