Count occurrences of a substring: Difference between revisions
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=={{header|Emacs Lisp}}==
Two Emacs Lisp solutions are shown below
<syntaxhighlight lang="emacs lisp">
;; version 1, which takes advantage of the how-many function,
;; which runs only in a buffer
(defun count-substrings (text substring)
"Count non-overlapping occurrences of SUBSTRING in TEXT."
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(goto-char (point-min)) ; go to the beginning of the buffer
(how-many substring))) ; count how many occurrences of SUBSTRING
;; version 2, which operates on a string
(defun count-substrings (text substring)
"Count non-overlapping occurences of SUBSTRING in TEXT."
(let ((substrings)) ; empty list to add occurrences of SUBSTRING as we find them
(while (string-match substring text) ; as long as we can find SUBSTRING in TEXT
(push (match-string 0 text) substrings). ; add the SUBSTRING we found to the list of substrings
(setq text (replace-match "" nil nil text))) ; remove SUBSTRING from text, and repeat while loop
(length substrings))) ; count number of items in substrings list
</syntaxhighlight>
{{out}}
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