egrep help please

[JamesJ2002]

Hello, I need to search a file for strings containing nested round brackets (( i.e at least 1 set inside another set, and there must be 2 opening brackets earlier in the string than the 2 closing brackets. the rest of the string can contain anything, including more brackets, can anyone help?
Thanks in advance

James

 

[marrow]

I'm not 100 % certain of what you want but grep will work: -

grep "((" your_file_name