[Boost-users] [spirit] Qi rule for GPS NMEA

Subject: [Boost-users] [spirit] Qi rule for GPS NMEA
From: Michael Powell (mwpowellhtx_at_[hidden])
Date: 2013-09-05 21:39:34

Hello,

I'm digging into a qi rule for GPS NMEA and want to approach it as a
kind of 2-pass parser. First pass to extract the message and
hex-formatted checksum. Next pass to parse out the actual messages
from the message.

I believe I comprehend how to go about the second pass. For the first
pass, I want to parse $XYZ*HH\r\n.

That's the literal '$', and everything between there and the literal
'*', followed by the two hex characters, as a complete field, followed
by the terminal CR+LF.

How do I express the "all characters excluding '*'" for the NMEA
message? Then the hex field?

Thanks...

Regards,

Michael Powell