[Bash regex] Need some help with regular expression

[lucky_strike]

Hi,
I am new to forums and Id like to ask a question. I hope this is the right place to ask that question.

Im writing some scripts in CentOS 7 and I need some help with regular expressions. I have read a lot but my tests gone bad.

Ive got output copied into text file

BRIDGE-MIB::dot1dTpFdbPort.'..L2G.' = INTEGER: 29
BRIDGE-MIB::dot1dTpFdbPort.'..$..F' = INTEGER: 3
...

What I want is to get the red strings into array, no matter how many similar lines I get.

I have tried something like this:

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array=($(cat test.txt | grep -o -E \'[!-~]{6}\' ))

But its not working. Desired result is to get array with items that are in red in my example. It would be good if there were no ' chars.

Please help me, Thank You

[jlehtone]

1. This question is not about CentOS. There ought to be more specific Fora out there.

2. This question is not about Bash either. Bash has only "pattern matching" / "globbing". See https://www.tldp.org/LDP/abs/html/globbingref.html

3. Grep, sed, awk, perl, etc do regular expressions (RE), but there are many dialects of RE.

4. That said, this is greedy but might suffice:

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sed "s/.*'\(.*\)'.*/\1/" test.txt

[lucky_strike]

Thank You for Your answer.

4. It is all I needed.