Neon created LOGBACK-1446:
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Summary: Make property references escapable
Key: LOGBACK-1446
URL: https://jira.qos.ch/browse/LOGBACK-1446
Project: logback
Issue Type: Improvement
Components: logback-core
Affects Versions: 1.3.0-alpha4, 1.2.3
Reporter: Neon
Assignee: Logback dev list
As you requested in my
[PR|https://github.com/qos-ch/logback/pull/445#issuecomment-445518600] I
created an account and issue for this matter.
Short description from the pull request for searchability in JIRA:
{panel}
Currently it's not possible to escape strings like {{${some.property}}} in
the logback.xml.
This is escpecially problematic when trying to use a replacement command with
named groups in the appender pattern.
Therefore something like this will attempt to insert a property value instead
of the named group: {{%replace(%msg){'(?<namedGroup>somestuffhere)',
'${namedGroup}'}}}.
I kept this example as simple (stupid) as possible for demonstration
purposes since real world patterns where you need named groups often are
pretty complex.
{panel}
As stated in my solution the implementation could be improved. Currently each
of the characters {{$}}, {{{}}, {{:}} and {{}}} are affecting the
token state even if the string doesn't represent a property reference, such as
{{{test}}} or {{test:test}}. Maybe I'm missing something and the
curly braces have a special meaning even without a preceding dollar sign, but
otherwise the tokenizer could be more strict, so escaping would only need a
single {{\}} in front of the dollar sign (like {{\${escaped}}}).
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