wanted to build html/script parser, this is the vverymost basic form of the parse loop with no numeric stack value

scan_splicer.rb

def scan_splicer(s,b,e) # i.e.: "<tag>", "</tag>"
  if s.to_s == "" or b.to_s == "" or e.to_s == "";  raise "Invalid arguements passed.";  end
  if s.length<=(b.to_s.length+e.to_s.length);  raise "Input string is too small.";  end
  
  pos=0;  stack = false;  list=[]
  if b.length > e.length ;  buffer_length = b.length;  else;  buffer_length = e.length;  end
  buffer = []; buffer_length.times{ buffer << "" }
  empty_buffer=[]; buffer_length.times{ empty_buffer << "" }
  empty_buffer2=[]; buffer_length.times{ empty_buffer2 << "" }
  tag1=empty_buffer; b.split('').each { |ch| empty_buffer << ch ;  empty_buffer.delete_at(0) }
  tag2=empty_buffer2; e.split('').each { |ch| empty_buffer2 << ch ;  empty_buffer2.delete_at(0) }
  
  loop do
    if s[pos].to_s=="";  break;  end	
    buffer << s[pos];  buffer.delete_at(0)
	if stack;  list << s[pos];  end
	str=buffer.join('');  tag = tag1.join('')
    m=true;  i=0
    tag.reverse.split('').each{ |ch| if ch.to_s!=str.reverse[i].to_s and ch.to_s != ""; m=false; break; end; i+=1 }	
    if m == true;  stack = true;  end
	tag = tag2.join('')
    m=true;  i=0
    tag.reverse.split('').each{ |ch| if ch.to_s!=str.reverse[i].to_s and ch.to_s != ""; m=false; break; end; i+=1 }	
	if m == true;  stack = false;  end
	pos+=1
  end
  
  if list.length == 0;  return ""
  else;  return list.join('')[0..("-"+(e.length+1).to_s).to_i]
  end 
end