Replace every occurnce of the regular expression matching with a perticular in VI editor? : suppose i have a text file as follows.

    create table "kevin".tb1 {
    col1,
    col2
    }
    create table "jhone".tb2 {
    col1,
    col2
    }
    create table "jake".tb3 {
    col1,
    col2

    }

I need to obtain that text file as follows by replaceing every table owner name occernces raplace witha same name called "informix".

out put should be like 

    create table "informix".tb1 {
    col1,
    col2
    }
    create table "informix".tb2 {
    col1,
    col2
    }
    create table "informix".tb3 {
    col1,
    col2
    }