the
regInstr
of
(
haystack ,
needle )
regInstr
(
haystack ,
needle )
Haystack yields any string
. Needle yields a string
describing a regular expression.
The regInstr
function returns the index of the first appearance of the regular expression needle in the string haystack, starting at 1. If needle cannot be found in haystack, zero
is returned.
This function is regular expression-based. For a literal version of this function, see instr
or csInstr
.
This function is similar to regOffset
, but the arguments are in reverse order.