errorformat when error is not a number

I have setup my errorformat quite nicely to match the compiler and lint output, however today I bumped onto a new error format:

<offending expression>
^
"path/to/the/file",<line number><white space>Error[Pe<error number>]:<white space><error message>v

Vim usually displays error number next to the error, but for the error number it matches exactly that - a number. Does anybody know if there is a way to make it match also a string for error number, i.e. Pe[<error number>] so that vim could display it like

<path to the file|<line number> col <column number> error Pe<error number>| error message

I know how to set it up if there is no Pe in the error number, but I would like to be able to stick "Pe" between the two pipes (vertical lines).

Any help is appreciated.

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