How to check in elisp if a string is a substring of another string?

Question

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.

lunaryorn · Answer 1 · 2015-08-19 14:00:46Z

up vote 6 down vote

The standard Emacs Lisp approach is regular expression matching:

(string-match-p (regexp-quote needle) haystack)

answered 12 hours ago

lunaryorn
5,33511335

Thanks, works well. – Name 12 hours ago

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legoscia · Answer 2 · 2015-08-19 13:57:43Z

up vote 4 down vote

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")
nil

answered 12 hours ago

legoscia
2,501828

Thanks, this correctly answers the question. Let me wait for some other solutions. – Name 12 hours ago

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2 Answers 2