grep based on regex not matching anything - regex

Question

I am trying to grep by regex but I am having trouble figuring out what is wrong with my regex. I couldnt find any bash regex testers out there so this has been really hard to figure out.
Here is my regex
[0-9]*\.[0-9]*[G][:space:]*\.\/[bbg-sevent-test-][0-9]*
I am trying to match my regex to this piece of text
2.0G ./bbg-sevent-test-132^M
The command I am running is:
./kafka_prefill.sh | sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g" | grep '[0-9]*\.[0-9]*[G][:space:]*\.\/[bbg-sevent-test-][0-9]*' > data3.txt
What this does is run my script, translate/remove parts of my output, then grep based on regex and put it in the file data3.txt
I am currently getting this error:
grep: Invalid range end
** update ** thanks to Ed Plunkett
updated regex:
^[0-9]*\.[0-9]*[G][[:space:]]*\.\/bbg-sevent-test-[0-9]*$
My command no longer has a regex error. However nothing is matching. Here is a sample output:
********************************************************************************^M
This is a private computer system containing information that is proprietary^M
and confidential to the owner of the system. Only individuals or entities^M
authorized by the owner of the system are allowed to access or use the system.^M
Any unauthorized access or use of the system or information is strictly^M
prohibited.^M
^M
All violators will be prosecuted to the fullest extent permitted by law.^M
********************************************************************************^M
Last login: Tue Dec 29 16:43:23 2015 from 10.81.64.204^M^M
sudo bash^M
cd /data/kafka/tmp/kafka-logs/^M
du -kh . | egrep "bbg-sevent-test-*"^M
-bash: ulimit: open files: cannot modify limit: Operation not permitted^M
### Trinity env = prod ###^M
### Kafka Broker Id = 1 ###^M
### Kafka Broker must be started as root!! ###^M
exit^M
exit^M
### Trinity env = prod ###^M
### Kafka Broker Id = 1 ###^M
### Kafka Broker must be started as root!! ###^M
^[]0;root#ip-10-81-66-20:/home/ec2-user^G^[[?1034h[root#ip-10-81-66-20 ec2-user]# cd /data/kafka/tmp/kafka-logs/^M
^[]0;root#ip-10-81-66-20:/data/kafka/tmp/kafka-logs^G[root#ip-10-81-66-20 kafka-logs]# du -kh . | egrep "bbg-sevent-test-*"^M
2.2G ./bbg-sevent-test-439^M
2.2G ./bbg-sevent-test-638^M
2.2G ./bbg-sevent-test-679^M
2.2G ./bbg-sevent-test-159^M
I am only trying to match this bit
2.2G ./bbg-sevent-test-159

Answer 1

Why is this in square brackets?
[bbg-sevent-test-]
If you are matching that entire literal string, including brackets, escape them:
\[bbg-sevent-test-\]
If you're not matching the brackets as literal characters, leave them out:
bbg-sevent-test-
Looks to me like you don't really want them there. In a regex, text you match literally is just slapped in there as-is, no special syntax required except for escaping special characters like []*+?(). etc.
What you've got there is, syntactically, a range -- but a broken one, since there's nothing after the last hyphen. However, a range is clearly not your intent.