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To find lines with a hyphen in position 97, I type:

^.{96}-

in the 'Find What' box, tick "Regular Expression" then click "Find All" but a dialog box is displayed saying "Cannot find regular expression: '^.{96}-'

(In the Preferences Edit menu. the "Use POSIX regular expression syntax" box is ticked).

Is there something "special" about searching for a hyphen?

No, there isn't. Hyphen is "special" only when enclosed in square brackets.

Are you sure the character position is correct? Are you sure it's a hyphen?

[b][size=18]CORRECTION[/size].[/b]

To find lines with a hyphen in position 93, I type:

^.{92}-


Here are some examples of my data:

009601705-4
008514276-7
008516513-7
009701511-4
009600208-9

(The character before each hyphen is in positon 92).

You are using "Posix" regular expression syntax, aren't you?

Yes, in the Preferences Edit menu. the "Use POSIX regular expression syntax" box is ticked

I found the problem: At the beginning of each line, there was a tab character.

Subtracting the number of positions represented by the tab character from the number in my original regular expression resulted in successful "finds".