If you want to match "fish" exactly and want to only find it with spaces 
around it, e.g., no periods or other characters allowed with fullword, 
consider using a hex string:

$fish = { 20 66 69 73 68 20}

This would match only exactly on situations where there is a space followed 
by the word "fish" and another space.  

you can also consider this situation with a text string, which does 
something similar, where \x20 equates to a space.

$fish2 = "\x20fish\x20"

If other situations outside of a space need to be considered, you can 
address those as well in either a string or hex string.

On Tuesday, December 24, 2019 at 1:21:35 AM UTC-6, Nibin V M wrote:
>
> Hello,
>
> Is it possible to write rules for exact string match? That is, I want to 
> detect string "fish" but not "fishing".
>
> Thanks in advance.
>

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