Microsoft® JScript
indexOf Method

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Language Reference 


Finds the first occurrence a substring within a String object.


strVariable.indexOf( substring, startindex )
"String Literal".indexOf( substring, startindex )

The indexOf method syntax has these arguments:

Part Description
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.


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 out of bounds (either negative or larger than the greatest character position index), startindex is treated as zero if negative, and as the largest possible index if too large.

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

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