StringContains

Tests if a string contains a given substring.

Syntax

• StringContains(s, x[, f[, δ]])

  • s is the string to be searched

  • x is the substring to search for

  • f is a string

  • δ is a positive integer

Description

If s and x are strings, then StringContains returns true iff s contains x as a substring, subject to any additional restrictions imposed by the remaining arguments.

f specifies flags for the algorithm. It is a string that can contain zero or more of the following characters:

• i: Makes StringContains search for x in a case-insensitive manner.

• w: Makes StringContains only consider x to be a substring of s if x is found as a full word in s.

If omitted, f defaults to "" (no options).

Finally, if δ is specified, StringContains will begin searching s for x at character index δ in s (the first character having index 1).

Examples

StringContains("Nargles can be somewhat obnoxious creatures at times.", "nargle")

false

StringContains("Nargles can be somewhat obnoxious creatures at times.", "nargle", "i")

true

StringContains("Nargles can be somewhat obnoxious creatures at times.", "nargle", "iw")

false

Alice ≔ ExampleData("Alice in Wonderland");

StringContains(Alice, "dinner", "iw")

true

StringContains(Alice, "pyruvate dehydrogenase complex", "iw")

false