Substitute multiple words in one go

You can use this for dynamic number of replacements. Create rule inputs accordingly. subString and replacement are text array inputs.

Example: 

Inputs:
ri!sentence: Quick brown fox jumps over the lazy dog 

ri!subString: {"brown","fox","dog"}

ri!replacement: {"black","dog","sheep"}

if(
  count(ri!subString) <> count(ri!replacement),
  "Invalid replacement configuration. Please ensure that replacements are correctly specified.",
  reduce(
    fn!substitute,
    ri!sentence,
    merge(ri!subString, ri!replacement)
  )
)

You can use this for dynamic number of replacements. Create rule inputs accordingly. subString and replacement are text array inputs.

Example: 

Inputs:
ri!sentence: Quick brown fox jumps over the lazy dog 

ri!subString: {"brown","fox","dog"}

ri!replacement: {"black","dog","sheep"}

if(
  count(ri!subString) <> count(ri!replacement),
  "Invalid replacement configuration. Please ensure that replacements are correctly specified.",
  reduce(
    fn!substitute,
    ri!sentence,
    merge(ri!subString, ri!replacement)
  )
)

This is a 7-year-old post..!!

And it uses a!localVariables without any local variables ...

I experimented locally, and when making it dynamic with rule inputs, I inadvertently left in a!localvariables. Thank you for bringing that to my attention; I'll update the final response accordingly.

Guess I brought a time machine to a forum post. My bad!