This suggests that FFIND's /TE option is leaving the 'E' in the regex.
I can't make FFIND /TE find any text in any file.
Code:
v:\> ffind /te"[Tab" /v d:\tcmd.ini
TCC: premature end of char-class "(?i)e"[Tab""I can't make FFIND /TE find any text in any file.