Port log4j-api changes from 2.x
#2208
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We change the order in which `FormattedMessage` checks the format of the
provided pattern: we first check for the presence of `{}` placeholders
and only then for `java.util.Format` specifiers.
This eliminates the need for a potentially exponential regular
expression evalutation, which was reported by Spotbugs (apache#1849).
The Javadoc and documentation were improved to clarify the heuristic
used by `FormattedMessage`.
Closes apache#1223.
Remark: since `FormattedMessage` used the **same** regular expression as
`java.util.Format`, if a message uses `java.util.Format` specifiers, it
is still vulnerable to a ReDOS.
Ports minor changes in `log4j-api` from `2.x`.
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This PR is based on #2203 and should be merged after it.
It ports to
mainthe changes in:ParameterFormatterrewrite with improved escape handling #1639