common-lisp CL-INTERPOL is a library for Common Lisp which modifies the reader so that you can have interpolation within strings similar to Perl or Unix Shell scripts. It also provides various ways to insert arbitrary characters into literal strings even if your editor/IDE doesn't support them. Here's an example: * (let ((a 42)) #?"foo: \xC4\N{U with diaeresis}\nbar: ${a}") "foo: ÄÜ bar: 42"