string StringSubstr	(	string	text,
		int	start,
		int	length
	)

Extracts a substring from a text string starting from the specified position

Parameters

text	String to extract a substring from
start	Initial position of a substring. Can be from 0 to StringLen(text) -1
length	Length of an extracted substring. If the parameter value is equal or less than 0 or parameter isn't set, the substring will be extracted from the indicated position till the string end

Returns

Copy of a extracted substring, if possible. Otherwise returns an empty string