A common thing with flipflop is to want to exclude one or both endpoints.
To do this, you need to actually check the scalar value returned by the ..
operator; it will be a number beginning at 1 when the flip condition is
met and increasing once each time thereafter, with an "E0" appended when
the flop condition is met. (False is returned as "".)
Anyway, here are some examples. Better suggestions greatly encouraged.
$ cat data
$ # Include both endpoints
$ perl -wlne'print if /start/../end/' data
$ # Exclude starting point
$ perl -wlne'print if ((/start/../end/) || 0) > 1' data
$ # Regex alternative for exclude starting point
$ perl -wlne'print if (/start/../end/) =~ /^(?!1(?!\d))\d/' data
$ # Exclude ending point
$ perl -wlne'print if (/start/../end/) =~ /^\d+$/' data
$ # Exclude both endpoints
$ perl -wlne'print if (/start/../end/) =~ /^\d+(?<!^1)$/' data
$ # or:
$ perl -wlne'print if (/start/../end/) !~ /^1?$|E/' data
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