CODEWITHSUNDEEP
stringocaml
priyanka
priyanka

Reputation: 943

Substring check in Ocaml

Can someone help me in coding an effective substring check in OCaml? Given two strings, check whether the first one contains the second one?

Using the Str module, can we do this?

Upvotes: 21

Views: 10015

Answers (2)

ESRogs
ESRogs

Reputation: 2368

let contains_substring search target =
    String.substr_index search target <> None

Upvotes: -1

Jeffrey Scofield
Jeffrey Scofield

Reputation: 66803

Something like this might work:

let contains s1 s2 =
    let re = Str.regexp_string s2
    in
        try ignore (Str.search_forward re s1 0); true
        with Not_found -> false

Here are some tests of the function:

# contains "abcde" "bc";;
- : bool = true
# contains "abcde" "bd";;
- : bool = false
# contains "abcde" "b.";;
- : bool = false
# contains "ab.de" "b.";;
- : bool = true

Upvotes: 17

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