Extracting a part of String using grep/sed

Question

I have a file in linux with similar entries as below

dn: CN=HP_NetworkSupport,OU=groups,DC=HDFCSLDM,DC=COM
dn: CN=Review users,OU=groups,DC=HDFCSLDM,DC=COM
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Answer 1

perl -lne 'print $1 if(/CN=([^\,]*),/)' your_file

Tested Below:

> cat temp
dn: CN=HP_NetworkSupport,OU=groups,DC=HDFCSLDM,DC=COM
dn: CN=Review users,OU=groups,DC=HDFCSLDM,DC=COM
> perl -lne 'print $1 if(/CN=([^\,]*),/)' temp
HP_NetworkSupport
Review users
>