common-lispsequence - how to split a sequence


  1. split regex target-string &key start end limit with-registers-p omit-unmatched-p sharedp => list
  2. lispworks:split-sequence separator-bag sequence &key start end test key coalesce-separators => sequences
  3. split-sequence delimiter sequence &key start end from-end count remove-empty-subseqs test test-not key => list of subsequences

Split strings using regular expressions

The library CL-PPCRE provides the function split which allows us to split strings in substrings that match a regular expression, discarding the parts of the string that do not.

(cl-ppcre:split "\\." "")
;; => ("127" "0" "0" "1")


Simple split of an IP number string.

> (lispworks:split-sequence "." "")
  ("127" "0" "0" "1")

Simple split of an URL:

> (lispworks:split-sequence ".:/" ""
                            :coalesce-separators t)
("http" "127" "0" "0" "1" "foo" "bar" "html")

Using the split-sequence library

The split-sequence library provides a function split-sequence, which allows to split on elements of a sequence

(split-sequence:split-sequence #\Space "John Doe II")
;; => ("John" "Doe" "II")