There are Regex and there are Regex's. Unfortunately not all implementation=
s
are compatible with each other. What implementation are you using.

-- Bob Ammerman
RAm Systems

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Michael Rigby-Jones
Sent: Thursday, January 24, 2013 6:18 AM
To: Microcontroller discussion list - Public. (piclist@mit.edu)
Subject: [OT] Regex help

I have been messing around with a GSM modem to send and receive text (SMS)
messages and  I would like to use a regex expression to parse the string I
get when I receive a text message.  However, I have very little experience
with regular expressions simply because I very rarely need to use them.   I
am having trouble when it comes to extracting a field that may either be
null or could be a quoted string.  If it is present, I would like to extrac=
t
the string without the quotes, or return null if not present

e.g.

Field of interest is null  ( [CR]=3Dcarriage return [LF]=3Dline feed )

+CMGL: 1,"REC READ","2030",,"13/01/22,11:10:03+00",129,14[CR][LF]
This is a test[CR]

Field of interest is "Fred" though I don't want the actual quotes extracted

+CMGL: 1,"REC READ","2030","Fred","13/01/22,11:10:03+00",129,14[CR][LF]
This is a test[CR]

My regex so far is this (after messing around with 'Expresso' for a while!)

\+CMGL: (\d+),"(.+)","(.+)",(.*),"(.+)",(\d+),(\d+)\r\n(.+)\r

This mostly works, but if the field is present it extracts the quotes which
I don't want, e.g. the capture groups are:

1: 1
2: REC READ
3: 2030
4: "Fred"
5: 13/01/22,11:10:03+00
6: 129
7: 149
8: This is a test

So how do I ditch the quotes if they are present?

Thanks

Mike





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