Just add this around line 18 after the includes and before initialize's definition

```ruby
  include Msf::Auxiliary::Scanner

  #
  # CONSTANTS
  #
  
  # Used in to check if remote is eHealth
  EHEALTH_REGEXP = /Welcome to the CA <i>e</i>Health<sup><font size=4>&reg/
  
  #
  # Methods
  #

  def initialize(info={})
```

then use the constant on line 70

```ruby
if (res and res.code.to_i == 200 and res.body.match(EHEALTH_REGEXP) != nil)
```