How to check if a string s1 is a substring of another string s2?

For example (test-substring "f t" "df tj") --> t, (test-substring "ft" "df tj") --> nil.


The standard Emacs Lisp approach is regular expression matching:

(string-match-p (regexp-quote needle) haystack)
|improve this answer|||||

cl-search can do that (and also returns the index of the substring, if found):

ELISP> (cl-search "f t" "df tj")
1 (#o1, #x1, ?\C-a)
ELISP> (cl-search "ft" "df tj")
|improve this answer|||||
  • 1
    Thanks, this correctly answers the question. Let me wait for some other solutions. – Name Aug 19 '15 at 14:03

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.