If 'some code #2' is very small or can be packaged into a single function call, I might go with that. Or I might just make it obvious that we only want/expect this once in the one loop:

my $got_alpha;
while (<FILE>) {
  unless ($got_alpha) {
    if (/alpha/) {
      #...alpha code
      $got_alpha++;
      next;
    }
  }
  # ...more code
}

[download]
Update: And I just noticed the part in the OP where it says "without a flag variable"...oh, well...

In reply to Re^2: A way to avoid repeated conditional loops by runrig
in thread A way to avoid repeated conditional loops by Deus Ex

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