Like I am having a data like
1 -> (abc
2-> abc)
one having opening parenthesis and 2 having closing parenthesis.
I am expecting like I have txt file I have both mistakes while entering and missing want to echo all the occurrence of opening but absence of closing while another one is if only closing present. I am using bash code but it only shows for occurrence of opening but absence of closing parenthesis my code is grep -E '^[^()]*\([^()]*$|^[^()]*[^()]*\([^()]*$' and this shows only result for ( abc
but not for abc). please help me out Thanks.
Perhaps this regex is what you are looking for
grep -E '^[^()]*[()]{1}[^()]*$'