Difference between revisions of "RAT()"

Latest revision as of 07:22, 15 September 2014

Purpose

Function to search for a substring

Syntax

RAT(<expC1>, <expC2> | <memofield> [, <expN>])

See Also

AT(), AT_C(), ATNEXT(), CHRTRAN(), CHRTRANC(), INLIST(), LEFT(), LEFTC(), LEN(), LENC(), OCCURS(), RAT_C(), RIGHT(), RIGHTC(), SET STRESCAPE, STR(), STREXTRACT(), STRLEN(), STRTRAN(), STUFF(), STUFFC(), SUBSTR(), SUBSTRC()

Description

The RAT() function is a substring search function. It will search <expC2> or the specified memo field for the last occurrence of <expC1> and return the starting position as a numeric value. If the substring is not contained within the second character expression or memo field, then the function returns the value 0. The leftmost character of a string is in character position 1. The RAT() function will return the starting position of the specified occurrence of <expC1> when the optional numeric expression <expN> is used. The RAT() function is particularly useful in conjunction with RIGHT() or SUBSTR() functions for locating starting points for text extraction.

Example

? rat("is", "is is is")
         7
cString1 = "fa"
cString2 = "Lianja is fast"
? rat(cString1, cString2)
        11
?rat("Step", notes, 8)
        24