Re: Using %scan and %subst vs pointers

[Glenn Gundermann <glenn.gundermann@xxxxxxxxx>]

Check out using FOR-EACH to accomplish the "multiple scans".

Yours truly,

Glenn Gundermann
Email: glenn.gundermann@xxxxxxxxx
Cell: (416) 317-3144

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On Fri, 3 Jun 2022 at 12:05, Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

> Hi,
>
> I was trying to write a routine to get a value of a field from a string.
> The field starts with an identifier, which is x'1c' + 2 characters. The
> field ends when either a new field starts with either x'1c', x'1d' or
> x'1e', or if it is the last field in the string, it would have all spaces
> after it.
>
> Would it be more efficient to use %scan to find the start and end positions
> and then %subst to extract the value, or use some sort of pointer code to
> go thru the string character by character to do my own search? Or use a
> combination of both?
>
> My first scan to find the start of the field is simple. But to get the end
> of field, I will have to do multiple %scans for each of the 3 possible
> characters (unless I am missing something).
>
> So would it be better to use %scan to find the start of the field, and then
> use pointers to find the end.
>
> I have never used pointers for this kind of thing, but I think it should be
> possible.
>
> Any thoughts or suggestions would be appreciated.
> TIA
> Vinay
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