:a?????????
eeeeeefffff?hhhh
aaa::??????
:?.\?
sed 's/:?.?/z/' test
:a?????????
eeeeeefffff?hhhh
aaa:z???
:?.\?
in output how "aaa:z???" comes? I cannot figure it out.
on rubular on line regex engine If i use ':?.?' for text 'aaa::??????'it matches every single character