Maven plugin to replace text in file

[David Hoffer]

Hi,

I need to process a file during the build to replace constructs like this:

"allOf": [
  {
    "$ref": "#/definitions/Eligibility"
  }
],

to be:

"$ref": "#/definitions/Eligibility",

Where the $ref can point to anything.  How can I do this sort of writing
custom code?

-Dave