☜	$FIND 1984 Version of ANSI Standard					☞

3.2.8 Functions function

$F[IND] (expr₁, expr₂)

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, intexpr3)

Let a be the value of expr₁, let b be the value of expr₂, and let m be the value of intexpr₃. $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 O; otherwise, $F(a,b,m) = p + max(m,1) - 1.

See also the transition diagram for $Find.

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Copyright © Annotations: 2008-2024 Ed de Moel.

This page most recently updated on 13-Sep-2014, 16:41:44.

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