substitution operator :s in VIM in unix

Question

In unix, while using VIM and the substitue command I am unable to replace the value to a string containing special character /

 :%s/var1/"ab1/ab2/ab3"/g

I need to replace the entire file containing var1 with ab1/ab2/ab3

Output in vim I see: Trailing characters

Answer 1

Escape both / like so \/.....