StringPos

Returns the position of the first occurrence of a given substring in a string.

Syntax

• StringPos(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 StringPos returns the character position of the first character of the first occurrence of x in s subject to any additional restrictions imposed by the remaining arguments. The position of the first character of s is 1. If x isn’t found in s, then 0 is returned.

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

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

• w: Makes StringPos 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, StringPos will begin searching s for x at character index δ in s (the first character having index 1).

Examples

'("rabbit", "beautiful", "extraordinary", "mirror") @ (word ↦ StringPos(Alice, word, "i"))

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