Regex Capture Parts of Line - regex

Question

I have been struggling to capture a part of an snmp response.
Text
IF-MIB::ifDescr.1 = 1/1/g1, Office to DMZ
Regex
(?P<ifDescr>(?<=ifDescr.\d = ).*)
Current Capture
1/1/g1, Office to DMZ
How to capture only?
1/1/g1
Office to DMZ
EDIT
1/1/g1
This should match the digit and forward slashes for the port notation in the snmp response.
(?P<ifDescr>(?<=ifDescr.\d = )\d\/\d\/g\d)
Link to regexr
Office to DMZ
This should start the match past the port notation and capture remaining description.
(?P<ifDescr>(?<=ifDescr.\d = \d\/\d\/g\d, ).*)
Link to regexr

Answer 1

You could just use the answer I gave you yesterday and split the first return group, 1/1/g10, by '/' and get the third part.
1/1/g10
split by '/' gives
1
1
g10 <- third part
Why use a more complicated regex when you can use simple code to accomplish the task?

Answer 2

With your shown samples, could you please try following regex with PCRE options available.
(?<=IF-MIB::ifDescr)\.\d+\s=\s\K(?:\d+\/){2}g(?:\d+)
Here is Online demo of above regex
OR with a little variation use following:
(?<=IF-MIB::ifDescr)\.\d+\s=\s\K(?:(?:\d+\/){2}g\d+)
Explanation: Adding detailed explanation for above.
(?<=IF-MIB::ifDescr) ##using look behind to make sure all mentioned further conditions must be preceded by this expression(IF-MIB::ifDescr)
\.\d+\s=\s ##Matching literal dot with digits one or more occurrences then with 1 or more occurrences of space = followed by one or more occurrences of spaces.
\K ##\K is GNU specific to simply forget(kind of) as of now matched regex and consider values in regex for further given expressions only.
(?:\d+\/){2}g(?:\d+) ##Creating a non-capturing group where matching 1 or more digits with g and 1 or more digits.
Without PCRE flavor: To get values in 1st capture group try following, confirmed by OP in comments about its working.
(?<=IF-MIB::ifDescr)\.\d+\s=\s((\d+\/){2}g\d+)

Answer 3

Here are my attempts.
const string pattern = ".* = (.*), (.*)";
var r = Regex.Match(s, pattern);
const string pattern2 = ".* = ([0-9a-zA-Z\\/]*), (.*)";
var r2 = Regex.Match(s, pattern2);

Answer 4

Using the named capture group ifDescr to capture the value 1/1/g1 you can use a match instead of lookarounds.
(Note to escape the dot \. to match it literally)
ifDescr\.\d+ = (?P<ifDescr>\d+\/\d+\/g\d+),
The pattern matches:
ifDescr\.\d+ = Match ifDescr. and 1+ digits followed by =
(?P<ifDescr> Named group ifDescr
\d+\/\d+\/g\d+ Match 1+ digits / 1+ digits /g and 1+ digits
), Close group and match the trailing comma
Regex demo

Answer 5

Do the following:
ifDescr\.\d+\s=\s((?:\d\/){2}g\d+)
The resultant capture groups contain the intended result. Note that \d+ accepts one or more digits, so you don't need the OR operator as used by you.
Demo
Alternatively, it looks like that the number after g will always be the number after ifDescr.. If that is the case, do this:
ifDescr\.(\d+)\s=\s((?:\d\/){2}g\1)
This basically captures the number in a group, then reuses it to match using backreference (note the usage of \1). The intended result in this case is available in the second capturing group.
Demo

Answer 6

I think is what you are looking for
= (.+), (.+)
It looks for "= " then captures all until a comma and then everything afterwards. It returns
1/1/g1
Office to DMZ
as requested.
See it working on regex101.com.