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 n=
ull or could be a quoted string.  If it is present, I would like to extract=
 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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