StringUtils.indexOf¶

Signature: StringUtils.indexOf(inputString, searchString, startPosition*)

Returns: Integer index - the first index of the searchString or searchChar, -1 if no match or null inputString

Finds the first index within the inputString, handling null. A null inputString will return -1. A negative startPosition is treated as zero. An empty ("") searchString always matches. A startPosition greater than the inputString length only matches an empty searchString.

Parameters¶

Type	Name	Description	Default
String	inputString	the String to check, may be null
String or char	searchString	the String or character to find, may be null
Integer	startPosition*	(optional) the `startPosition`, negative treated as zero	0

Example¶

// Examples of how to use the StringUtils.indexOf (0 based)
var input = "I am trying to find the number 17 starting spot1";

// Example: searchString as String
var firstIndexOfOne = StringUtils.indexOf(input, "1");            // 31
var firstIndexOfOneAfter40 = StringUtils.indexOf(input, "1", 40); // 47
var notFound = StringUtils.indexOf(input, "9");                   // -1


// Example: searchString as char
var firstChar = StringUtils.indexOf(input, '1');            // 31
var firstCharAfter40 = StringUtils.indexOf(input, '1', 40); // 47


// Example: empty searchString
var emptySearch = StringUtils.indexOf(input, "");           // 0


// Example: null inputString
var nullResult = StringUtils.indexOf(null, "1");            // -1