with-input-from-string

(with-input-from-string (stream string) body...)

Binds stream to an input stream reading from string, evaluates the body forms, and returns the value of the last one. read-line consumes the string line by line and returns nil at the end; read parses one datum per line (like read on a file stream, it is line-oriented, so the rest of a line after the first datum is skipped). Works in all three backends.