Lisp - Splitting Input into Separate Strings

lisp split string into characters
lisp trim string
common lisp multi-line string
common lisp symbol to-string
lisp sort string
lisp with-output-to-string
number to string lisp
make string lisp

I'm trying to take user input and storing it in a list, only instead of a list consisting of a single string, I want each word scanned in to be its own string. Example:

> (input)
This is my input. Hopefully this works

would return:

("this" "is" "my" "input" "hopefully" "this" "works")

Taking note that I don't want any spaces or punctuation in my final list.

Any input would be greatly appreciated.

split-sequence is the off-the-shelf solution.

you can also roll your own:

(defun my-split (string &key (delimiterp #'delimiterp))
  (loop :for beg = (position-if-not delimiterp string)
    :then (position-if-not delimiterp string :start (1+ end))
    :for end = (and beg (position-if delimiterp string :start beg))
    :when beg :collect (subseq string beg end)
    :while end))

where delimiterp checks whether you want to split on this character, e.g.

(defun delimiterp (c) (or (char= c #\Space) (char= c #\,)))

or

(defun delimiterp (c) (position c " ,.;/"))

PS. looking at your expected return value, you seem to want to call string-downcase before my-split.

PPS. you can easily modify my-split to accept :start, :end, :delimiterp &c.

PPPS. Sorry about bugs in the first two versions of my-split. Please consider that an indicator that one should not roll one's own version of this function, but use the off-the-shelf solution.

list - Lisp - Splitting Input into Separate Strings, I'm trying to take user input and storing it in a list, only instead of a list consisting of a single string, I want each word scanned in to be its own string. Example: where delimiterp checks whether you want to split on this character, e.g. (defun delimiterp (c) (or (char= c #\Space) (char= c #\,))) or (defun delimiterp (c) (position c " ,.;/")) PS. looking at your expected return value, you seem to want to call string-downcase before my-split.

For that task in Common-Lisp I found useful (uiop:split-string str :separator " ") and the package uiop, in general, has a lot of utilities, take a look at the docs https://common-lisp.net/project/asdf/uiop.html#index-split_002dstring.

The Common Lisp Cookbook – Strings, Hi, I want to split a string where the underscore is the split character. example: (​setq str vessel_name_type) I want the name in a separate  There's no one-liner in CL to reverse a string by word (like you would do it in Perl with split and join). You either have to use function from an external library like SPLIT-SEQUENCE or you have to roll your own solution. Here's an attempt: * (defun split-by-one-space (string) "Returns a list of substrings of string divided by ONE space each.

There's cl-ppcre:split:

* (split "\\s+" "foo   bar baz
frob")
("foo" "bar" "baz" "frob")

* (split "\\s*" "foo bar   baz")
("f" "o" "o" "b" "a" "r" "b" "a" "z")

* (split "(\\s+)" "foo bar   baz")
("foo" "bar" "baz")

* (split "(\\s+)" "foo bar   baz" :with-registers-p t)
("foo" " " "bar" "   " "baz")

* (split "(\\s)(\\s*)" "foo bar   baz" :with-registers-p t)
("foo" " " "" "bar" " " "  " "baz")

* (split "(,)|(;)" "foo,bar;baz" :with-registers-p t)
("foo" "," NIL "bar" NIL ";" "baz")

* (split "(,)|(;)" "foo,bar;baz" :with-registers-p t :omit-unmatched-p t)
("foo" "," "bar" ";" "baz")

* (split ":" "a:b:c:d:e:f:g::")
("a" "b" "c" "d" "e" "f" "g")

* (split ":" "a:b:c:d:e:f:g::" :limit 1)
("a:b:c:d:e:f:g::")

* (split ":" "a:b:c:d:e:f:g::" :limit 2)
("a" "b:c:d:e:f:g::")

* (split ":" "a:b:c:d:e:f:g::" :limit 3)
("a" "b" "c:d:e:f:g::")

* (split ":" "a:b:c:d:e:f:g::" :limit 1000)
("a" "b" "c" "d" "e" "f" "g" "" "")

http://weitz.de/cl-ppcre/#split

For common cases there is the (new, "modern and consistent") cl-str string manipulation library:

(str:words "a sentence    with   spaces") ; cut with spaces, returns words
(str:replace-all "," "sentence") ; to easily replace characters, and not treat them as regexps (cl-ppcr treats them as regexps)

You have cl-slug to remove non-ascii characters and also punctuation:

 (asciify "Eu André!") ; => "Eu Andre!"

as well as str:remove-punctuation (that uses cl-change-case:no-case).

How to split a string by character, Split a (character) string into comma (plus a blank) delimited strings based on a change of ldr x0,qAdrszString1 // input string address ldr x1  This method splits the given input sequence around matches of the pattern. Parameter for this is: input- the character sequence to be split. It returns the array of strings computed by splitting the input around matches of the pattern.

; in AutoLisp usage (splitStr "get off of my cloud" " ") returns (get off of my cloud)

(defun splitStr (src delim / word letter)

  (setq wordlist (list))
  (setq cnt 1)
  (while (<= cnt (strlen src))

    (setq word "")

    (setq letter (substr src cnt 1))
    (while (and (/= letter delim) (<= cnt (strlen src)) ) ; endless loop if hits NUL
      (setq word (strcat word letter))
      (setq cnt (+ cnt 1))      
      (setq letter (substr src cnt 1))
    ) ; while

    (setq cnt (+ cnt 1))
    (setq wordlist (append wordlist (list word)))

  )

  (princ wordlist)

  (princ)

) ;defun

Split a character string based on change of character, Separate the string "Hello,How,Are,You,Today" by commas into an array (or list) so that each 25 Common Lisp; 26 D; 27 Delphi; 28 Dyalect; 29 Déjà Vu; 30 E; 31 Elena; 32 Elixir; 33 Erlang (css->strs (split (coerce str 'list) delim))) which "​tokenize" each line of input and this is achieved by using "," as field separator  It takes a string of character(s) as first argument and a string as the second argument and returns a substring where all characters that are in the first argument are removed off the beginning of the argument string.

(defun splitStr (src pat /)
    (setq wordlist (list))
    (setq len (strlen pat))
    (setq cnt 0)
    (setq letter cnt)
    (while (setq cnt (vl-string-search pat src letter))
        (setq word (substr src (1+ letter) (- cnt letter)))
        (setq letter (+ cnt len))
        (setq wordlist (append wordlist (list word)))
    )
    (setq wordlist (append wordlist (list (substr src (1+ letter)))))
)

Tokenize a string, split some string into n-grams with default n=3, where we might want to apply (​fact "Tokenize an input string, splitting sentences along the way" (tokenize "Are  Hi, I want to split a string where the underscore is the split character. example: (setq str vessel_name_type) I want the name in a separate variable. Note: The amount of characters of name and type may vary.

Lisp - Not lost but found, What i want is that I want to split this list containing strings using parentheses as apply this function on all strings in your input list, and concatenate the result: The split() method splits a string into a list. You can specify the separator, default separator is any whitespace. Note: When maxsplit is specified, the list will contain the specified number of elements plus one .

LISP, The API ======= generic function **parse-input** `specification value &key This is similar to `split-sequence` however it only takes a string input and the delimiter `type` is a Common Lisp type against which the read object(s) is checked. Splitting Strings In Python, strings are represented as str objects, which are immutable: this means that the object as represented in memory can not be directly altered. These two facts can help you learn (and then remember) how to use.split (). Have you guessed how those two features of strings relate to splitting functionality in Python?

readme, SPLIT-SEQUENCE is a member of the Common Lisp Utilities family of Splits sequence into a list of subsequences delimited by objects  Common LISP provides numerous input-output functions. We have already used the format function, and print function for output. In this section, we will look into some of the most commonly used input-output functions provided in LISP. Input Functions. The following table provides the most commonly used input functions of LISP −

Comments
  • Checkout cl-cookbook.sourceforge.net/strings.html they have a bunch of common use case functions one of which is a simple space split which you could modify to remove punctuation and the like.
  • The Cookbook continues here: lispcookbook.github.io/cl-cookbook/strings.html
  • I find plenty of material on split-sequence, but apparently I need to import the cl-utilities package, which I just can't figure out how to do =/ #imanewb
  • @SeanEvans: careful! import is a CL function which you do not want here! what you need is install the package using, e.g., quicklisp: (ql:quickload "split-sequence")
  • This helped a lot. Thanks so much.
  • @sds: Your edit broke your code (for instance, test with "" and "a").
  • To clarify, the first code can't handle strings that end with a delimiter (e.g. "abc "), and the second version most of the times fails to get the last token (e.g. "ab cd" -> ("ab")).
  • While this may answer the question, it is always good to provide an explanation of your code and any references that may be helpful. Check out How to Answer for details on answering questions.