This GREP code is a combination of two codes with an IF condition using a Pipe sign (|)
[6-9]\d means any digit from 6 to 9 followed by any digit
= This code will select/search all the numbers starting with 6 to 9
| pipe sign means OR (a kind of if condition)
The second part [\d]{3,} will select all the digits with a minimum of 3 digits
It means that this code will select all the numbers…
Instead if you need to select the numbers from 60 to 99 then you can tweak the @Wosven code to:
[6-9]\d
but keep this in mind that this code will also search/select the numbers in between bigger numbers, therefore, you have to look for the numbers that are not preceded by a digit:
(?<=[\D])[1-4]\d
(?<=[\D])5\d
(?<=[\D])[6-9]\d
Similarly if you want to restrict your search to a two-three digit search string then you can add an additional code, like: {1} or {2} or {3}
(?<=[\D])[1-4]\d{2}
(?<=[\D])5\d{2}
(?<=[\D])[6-9]\d{1}
Hope this will help
