Re^2: Find Prefix if regex didn't match

[demoralizer]

in reply to Re: Find Prefix if regex didn't match
in thread Find Prefix if regex didn't match

Hi greengaroo,

show working code will be little bit hard because I'm listening to sockets... but here is sth. that should at least show what I'm trying to do:

# $term is the socket
# $text contains all received and unscanned text
# $scanned contains all scanned text

my $rec;

my $time = gettimeofday();
while(1)
{
# sth. to read?
  if (read($term, $rec, 0xFFFF))
  {
    # collect what have been read
    $text .= $rec;
  
    # expression found?
    if ($text =~ s/(.*)($expect)//s)
    {
      $scanned .= $1;
      $scanned .= "MATCH";
      $scanned .= $2;
      return 0;
    }
    # shorten string for speed up
    elsif (length($text) >= 20)
    {
      $scanned .= "CUTTED";
      $scanned .= substr($text, 0, length($text) - 20 + 1);
      $text = substr($text, length($text) - 20 + 1);
    }
  }
  
  # timeout?
  if (gettimeofday() - $time > $timeout)
  {
    $scanned .= "TIMEOUT";
    return 1;
  }
}

It seems that the "elsif (length($text) >= 20)" makes things faster but doesn't do exactly what I want because in this way I can lose possible matchings :(