Index - script and chart function

Index() searches a string to find the starting position of the nth occurrence of a provided substring. An optional third argument provides the value of n, which is 1 if omitted. A negative value searches from the end of the string. The positions in the string are numbered from 1 and up.

Syntax:

Index(text, substring[, count])

Return data type: integer

Arguments:

Arguments
Argument	Description
text	The original string.
substring	A string of characters to search for in text. Information noteIf the substring does not exist in the text, Index returns 0.
count	Defines which occurrence of substring to search for. For example, a value of 2 searches for the second occurrence.

Example	Result
Index( 'abcdefg', 'cd' )	Returns 3
Index( 'abcdabcd', 'b', 2)	Returns 6 (the second occurrence of 'b')
Index( 'abcdabcd', 'b',-2)	Returns 2 (the second occurrence of 'b' starting from the end)
Left( Date, Index( Date,'-') -1 ) where Date = 1997-07-14	Returns 1997
Mid( Date, Index( Date, '-', 2 ) -2, 2 ) where Date = 1997-07-14	Returns 07
Index('abc', 'x')	Returns 0 ('x' does not exist in the string 'abc')
Index('abc', 'a', 2)	Returns 0 (there is no 2nd occurrence of 'a')

Example: Script

T1:
Load 
*, 
index(String, 'cd') as Index_CD,               // returns 3  in Index_CD
index(String, 'b') as Index_B,                // returns 2 in Index_B
index(String, 'b', -1) as Index_B2;           // returns 2 or 6 in Index_B2
Load * inline [
String
abcdefg
abcdabcd ];

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