Reemplazar una cadena en todas las publicaciones

I used this example which works for replacing a URL. However, it’s not working for phrases.

Example:

rake posts:remap["I Don't Want This Phrase","But I Do Want This One","string",true]

I keep getting this error:

ERROR: Expecting rake posts:remap['find','replace',type] where type is string or regex

I tried it with the single quotes as shown in the error message as well, but no dice. I even tried by placing dashes between the words like in the delete word example. That gave me the same error.

Any advice?