RE:
    #set up flags and stuff
    branch $start
$advance:
    rePopindex
    reAdvance $fail
$start:
    reLiteral "f", $advance
    rePushindex
    rePushmark
$findo:
    rePushindex
    reLiteral "o", $findbar
    branch $findo
$backo:
    rePopindex $advance
$findbar:
    reLiteral "o", $backo
    set I0, 1
    reFinished
$fail:
    set I0, 0
    reFinished