We all know the pattern matching operator =~:

“hemanth” =~ /heman/ # Does match

But what about !=~? No errors, but always returns true:

"hemanth" !=~ /foo/  # => true
"hemanth" !=~ /bar/  # => true

# That's because it's parsed as:
"hemanth".!=(~/heman/)  # != is Object class, ~ is from R.E.

The Right Way: Use !~

"hemanth" !~ /heman/  # => false
"hemanth" !~ /foo/    # => true

Or use the match method:

!“hemanth”.match(“foo”) # => true