Lack of visual cue: Hint isn't shown in the "extract html" selectors, for when a full stop or hash, is missing (.#)

[desbest]

When filling in the selectors, it can be very easy to make unintentional spelling mistakes and be nonethewiser. Like typing in entrymenu a instead of .entrymenu a

Please add a visual cue, as a hint below the text box (textarea), so if a . or # isn't included in that text box for one of the lines, that it discreetly notifies the user of this, in case they forgot.

Something like this, would save me hours of time, when wondering why something doesn't work. Especially as the . is so small and we're not using monospaced programming fonts.

PS. By # I don't mean the prefix of a comment for Get Set Fetch that can go on the end of each line.