Use of "!~" operator in Ruby

"!~" can be used to have conditional statements to check if string doesn't match particular regular expression. So that whenever we want to check if particular string is not matching a regular expression we can avoid having negative conditional statements using "unless" like

unless "str" =~ /reg_exp/
 # do something
end

We can write this conditional statement as assertive condition as follows:

if "str" !~ /reg_exp/
 # do something
end