1. reader
    A library of configurable reader macros for common tasks such as:
  2. reader-interception
    reader-interception is a library for replacing the lisp reader with your own, so you can define your own syntax or compile other language through Lisp
  3. reattatchabe slime
    Here is a little makedef file to start/stop a lisp application and allow the developer to attach to the running process with attachtty or slime
  4. rebinding
    Here's a macro example
  5. recognize
    Common Lisp implementation of single pointer gesture recognition from Rubine's The Automatic Recognition of Gestures
  6. recursive-regex
    A library to extend CL-PPCRE to make regular expression named capture groups dispatch to custom matcher functions and named-expression patterns
  7. Red-Black-trees
    Red-Black-trees is an implementation of red-black-trees (a data structure)
  8. reeder
    A toy table-driven reader for Lisp, written in Common Lisp
  9. Regex
    Regex is a full-featured regular expression compiler and matching engine written by Michael Parker
  10. regex (library by asciian)
    A relatively incomplete (as of Jan 2018) relatively concise backtracking POSIX compatible regular expression library