Flex empty string

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I hear a rumor this is the place for online flex discussion.

I am a relative newbie and I want to match NMEA 0183 strings coming from a
GPS.

They look like this:
$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47

except when they look like this:

$GPGGA,123519,4807.038,N,01131.000,E,,,,,,,,,*47

In other words, many fields can be blank, but they are always comma -
delimited. When they exist they are nicely structured, e.g.
{DIGIT}{4}"."{DIGIT}{3} matches a latitude string.

So how do I distinguish between a field with some specific data and a
delimiter, and an empty string followed by the same delimiter?

Thanks.

Eric

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I hear a rumor this is the place for online flex discussion. <br><br>I am a relative newbie and I want to match NMEA 0183 strings coming from a GPS. <br><br>They look like this: <br>$GPGGA,123519,4807.038,N,01131.000,E,1,08,
0.9,545.4,M,46.9,M,,*47<br><br>except when they look like this:<br><br>$GPGGA,123519,4807.038,N,01131.000,E,,,,,,,,,*47<br><br>In other words, many fields can be blank, but they are always comma - delimited. When they exist they are nicely structured, 
e.g. {DIGIT}{4}&quot;.&quot;{DIGIT}{3} matches a latitude string. <br><br>So how do I distinguish between a field with some specific data and a delimiter, and an empty string followed by the same delimiter?<br><br>Thanks. 
<br><br>Eric<br>

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