JScript String Object indexOf Method

Finds the first occurrence of a substring within a String object.

Syntax: JScript String Object indexOf Method

strVariable.indexOf(substring, startindex)

"String Literal".indexOf(substring, startindex)

Arguments: JScript String Object indexOf Method

strVariable

The name of a String object.

substring

The substring to search for within the String object.

startindex

An optional integer value specifying the index to begin searching within the String object. If omitted, searching begins at the beginning of the string.

Remarks: JScript String Object indexOf Method

The indexOf method returns an integer value indicating the beginning of the substring within the String object. If the substring is not found, a -1 is returned.

If startindex is negative, startindex is treated as zero. If it is larger than the greatest character position index, it is treated as the largest possible index.

Searching is performed from left to right. Otherwise, this method is identical to the lastIndexOf method.