Problem with "grep" command

[madi]

I want to search a string with grep command that print every line that the file 'whois.sh' with the symbol '&', followed by the string 'whois' followed by a '.', then four other characters, followed by another a '.', followed by one or more characters, followed by ';;', followed by the end of the line.

I have given following command

egrep '&whois\..+\..+;;$' whois.sh

and its working. but I am unable to select 4 charachters followed by '.' character.
the command should be like this

grep -E '&whois\..{4}\..+;;$' whois.sh

but for me its not working. tell me its solution.

[pdppraveen]

Can you please post me a sample output of first Command "egrep '&whois\..+\..+;;$' whois.sh"

Can also try with grep -E "&whois\..{4}\..+;;$" whois.sh

If you want to know more on grep u can Check ou the below linux.
http: // howtouselinuxcommand.blogspot.com/2011/12/grep-linux-command.html