This prevents the following warning from being printed to console:
`regular expression has redundant nested repeat operator + /%\{(?<name>(?<pattern>[A-z0-9]+)(?::(?<subname>[[:alnum:]@\[\]_:.-]+))?)(?:=(?<definition>(?:(?:[^{}]+|\.+)+)+))?\}/`
The current grok expression is not failing, but just this warning is being printed.
The warning started being printed after upgrading joni (#47374).
Closes#47861
f48981f43c