what's the regular expression to find two sets of parenthesis in a row using perl?

Question

I have rows with different sets of parenthesis. For example

     (sdfsfs) (sfdsfd) 
     (sdfsfs) (sfdsfd) (sfdsfd) 
     (sdfsfs) (sfdsfd) (sfdsfd) (sfdsfd)
            


        

Answer 1

You can use this regex to match a line with exactly 2 parentheses sets:

m/^(\([^)]*\)\s*){2}$/

OR:

m/^\([^)]*\)\s*\([^)]*\)$/

RegEx Demo

[^)]* will match any character but ) and is more efficient than .*? or .*.