FSEARCH /T using regular expressions?

d:\tc34> ffind /t"[Tab" /v d:\tcmd.ini
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC: premature end of char-class "(?i)[Tab"
TCC...