Failure to build parser with the schema variable: `equals:.*=(?<var>.*[a-zA-Z0-9].*)`

[davidlion]

Bug

It is possible to build the variable equals:.*=.*[a-zA-Z0-9].*, but adding the capture group equals:.*=(?<var>.*[a-zA-Z0-9].*) causes building to not finish (with no other schema variables in the file). Afaik, in theory adding the capture group should not cause an issue. (edit: I'm not sure / confident)

We should investigate this case to see if there is at least a clear error we can return the user if it is indeed not possible to finish determinization.

Removing or changing the .* before = also makings building the parser complete. Therefore, y-scope/clp#1948 uses equals:[a-zA-Z0-9]+=(?<var>.*[a-zA-Z0-9].*) as a workaround.

log-surgeon version

193e1f9

Environment

It shouldn't be specific to any environment and multiple people have reproduced it locally. A confirmed environment is: Fedora 43 Linux 6.17.12-300.fc43.x86_64 installing dependencies through task.

Reproduction steps

Attempt to create a LogParser with a schema file containing the variable equals:.*=(?<var>.*[a-zA-Z0-9].*)