errorformat setup

I'm having trouble figuring out how to setup errorformat. I know the format of my compiler and lint tool is setup as follows:

"<filename>",<linenumber> <error type> <error number>: <error message>

but right from the start I'm having an issue. How do I specify quotation marks in the error format?

Also I have a side question. errorformat help talks about %*{conv}, %O/P/Q. I was not able to find definitions for those? Can anyone point me in the right direction?

Any help is appreciated.

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