Confusing error message for wikipedia tag

[GerdP]

What steps will reproduce the problem?

1. run validator on the attached file

What is the expected result?

a message like "wikipedia tag should not have URL-encoded values like '%27' "

What happens instead?

The error seems to contain the regExp of the rule:
wikipedia=(?i)^{[-a-z]{2,12}:.*%[0-9A-F][0-9A-F] tag should not have URL-encoded values like '%27'}

Please provide any additional information below. Attach a screenshot if possible.

Found this tagging in an older OSM file (Relation 1163244).

Build-Date:2019-05-06 07:55:22
Revision:15049
Is-Local-Build:true

Identification: JOSM/1.5 (15049 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1803 (17134)
Memory Usage: 890 MB / 1753 MB (605 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [-agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:59383, -ea, -Dfile.encoding=UTF-8]
Program arguments: [--debug]
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (34977)
+ apache-commons (34908)
+ buildings_tools (34982)
+ continuosDownload (82)
+ ejml (34908)
+ geotools (34908)
+ jaxb (34908)
+ jts (34908)
+ o5m (34908)
+ opendata (34977)
+ pbf (34908)
+ poly (34991)
+ reverter (34977)
+ undelete (34977)
+ utilsplugin2 (34977)

Validator rules:
+ c:\josm\core\data\validator\geometry.mapcss