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| ☜ | $FIND1990 Version of ANSI Standard | ☞ | ||||
See 2.3 for the definition of expr.
This form searches for the leftmost occurrence of the value of expr2 in the value of expr1. If none is found, $F returns zero. If one is found, the value returned is the integer representing the number of the character position immediately to the right of the rightmost character of the found occurrence of expr2 in expr1. In particular, if the value of expr2 is empty, $F returns 1.
$F[IND] ( expr1 , expr2 , intexpr )
See 2.3 for the definition of expr. See 2.2.4.1 for the definition of intexpr.
Let a be the value of expr1, let b be the value of expr2, and let m be the value of intexpr. $F(a,b,m) searches for the leftmost occurrence of b in a, beginning the search at the max(m,1) position of a. Let p be the value of the result of $F($E(a,m,$L(a)),b). If no instance of b is found (i.e., p=0), $F returns the value 0; otherwise, $F(a,b,m) = p + max(m,1) - 1.
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Copyright © Examples: 1995-2024 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2024 Ed de Moel.
This page most recently updated on 13-Sep-2014, 16:41:44.
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