#!/usr/bin/perl

# http://perlmonks.org/?node_id=1213573

use strict;
use warnings;

#print join('', <DATA>) =~ /^start.*\n(?:\+.*\n)*/gm; # my preference 
+:)

while(<DATA>)
  {
  /^start/ .. /^(?!start|\+)/ and /^(start|\+)/ and print;
  }

__DATA__
ignore this line :)
start text
+ 123
+ 456
+ 789
some other text not starting with +
another test case
start text
+ foo
+ bar
start text
+ one
+ two
+ three
also ignore this line

[download]

Outputs: 

start text
+ 123
+ 456
+ 789
start text
+ foo
+ bar
start text
+ one
+ two
+ three

[download]

In reply to Re: Greedy flip flop operator? by tybalt89
in thread Greedy flip flop operator? by chengchl

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