[DalekBaldwin]

Interpolation is its own can of worms, but if you just want to be able to encode absolutely anything without escape characters, you just need two delimiters:

  "*n  [stringA]  "*n
  "*n  [stringB]  '*n
  '*n  [stringC]  "*n
  '*n  [stringD]  '*n

Each string may contain runs of contiguous single or double quotes of length less than n, and furthermore:

stringA may start and/or end with a single quote

stringB may start with a single quote and/or end with a double quote

stringC may start with a double quote and/or end with a single quote

stringD may start and/or end with a double quote