Microsoft® JScript™ indexOf Method | Language Reference Version 1

See Also Applies To

##### Description

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

##### Syntax

> 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.

##### Remarks

> 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 lastIndexOf.

> The following example illustrates the use of the indexOf method:

> >     function IndexDemo(str2)
> >     {
> >       var str1 = "BABEBIBOBUBABEBIBOBU"
> >       var s = str1.indexOf(str2);
> >       return(s);
> >     }

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