Regex help, please

<?php // RAY_temp_non_regex.php
error_reporting(E_ALL);
echo "<pre>\n";
 
// FROM THE OP
$txt = 'asm
  MOV AX, 1234H
  MOV Number, AX
end;';
 
// DELIMITERS
$a = 'asm';
$z = 'end;';
 
// GET AN ARRAY OF ELEMENTS BROKEN ON $a
$arr = explode($a, $txt);
// VISUALIZE THE RAW DATA
var_dump($arr);
echo "\n";
 
// ITERATE OVER THE ARRAY
foreach ($arr as $key => $val)
{
    if (empty($val)) continue;
    $val = ereg_replace("$z" . '$', '', trim($val));
    echo "\n$val";
}

                                              

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<?php
$string = "asm
  MOV AX, 1234H
  MOV Number, AX
end;";
preg_match('/asm(.+)end;/s',$string,$matches);
$asm = $matches[1];
echo $asm;
?>

                                              

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<?php
$string = "asm
  MOV AX, 1234H
  MOV Number, AX
end;";
if (ereg('asm(.+)end;',$string,$matches))
{
	$asm = $matches[1];
	echo nl2br($asm);
}
?>

                                              

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<?php
/*************************************************************************************
 * delphi.php
 * ----------
 * Author: Járja Norbert (jnorbi@vipmail.hu)
 * Copyright: (c) 2004 Járja Norbert, Nigel McNie (http://qbnz.com/highlighter)
 * Release Version: 1.0.7.1
 * CVS Revision Version: $Revision: 1.2 $
 * Date Started: 2004/07/26
 * Last Modified: $Date: 2005/07/26 05:23:30 $
 *
 * Delphi (Object Pascal) language file for GeSHi.
 *
 * CHANGES
 * -------
 * 2004/11/27 (1.0.1)
 *  -  Added support for multiple object splitters
 * 2004/10/27 (1.0.0)
 *   -  First Release
 *
 * TODO (updated 2004/11/27)
 * -------------------------
 *
 *************************************************************************************
 *
 *   This file is part of GeSHi.
 *
 *   GeSHi is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   GeSHi is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with GeSHi; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 ************************************************************************************/
// 2 => '/asm(.*?)end;/is'
 
$language_data = array (
  'LANG_NAME' => 'Delphi',
  'COMMENT_SINGLE' => array(1 => '//'),
  'COMMENT_MULTI' => array('(*' => '*)', '{' => '}'),
  'CASE_KEYWORDS' => 0,
  'QUOTEMARKS' => array("'", '"'),
  'ESCAPE_CHAR' => '',
  'KEYWORDS' => array(
    1 => array(
      'And', 'Array', 'As', 'Asm', 'Begin', 'Case', 'Class', 'Constructor', 'Destructor', 'Div', 'Do', 'DownTo', 'Else', 
      'End', 'Except', 'File', 'Finally', 'For', 'Function', 'Goto', 'If', 'Implementation', 'In', 'Inherited', 'Interface', 
      'Is', 'Mod', 'Not', 'Object', 'Of', 'On', 'Or', 'Packed', 'Private', 'Procedure', 'Program', 'Property', 'Protected',
                        'Published','Public', 'Raise', 'Record', 'Repeat', 'Set', 'Shl', 'Shr', 'Then', 'ThreadVar', 'To', 'Try', 'Unit', 
                        'Until', 'Uses', 'While', 'With', 'Xor','Strict'
      ),
    2 => array(
      'nil', 'false', 'true', 'var', 'type', 'const'
      ),
    3 => array(
      'Abs', 'Addr', 'AnsiCompareStr', 'AnsiCompareText', 'AnsiContainsStr', 'AnsiEndsStr', 'AnsiIndexStr', 'AnsiLeftStr',
      'AnsiLowerCase', 'AnsiMatchStr', 'AnsiMidStr', 'AnsiPos', 'AnsiReplaceStr', 'AnsiReverseString', 'AnsiRightStr',
      'AnsiStartsStr', 'AnsiUpperCase', 'ArcCos', 'ArcSin', 'ArcTan', 'Assigned', 'BeginThread', 'Bounds', 'CelsiusToFahrenheit',
      'ChangeFileExt', 'Chr', 'CompareStr', 'CompareText', 'Concat', 'Convert', 'Copy', 'Cos', 'CreateDir', 'CurrToStr',
      'CurrToStrF', 'Date', 'DateTimeToFileDate', 'DateTimeToStr', 'DateToStr', 'DayOfTheMonth', 'DayOfTheWeek', 'DayOfTheYear',
      'DayOfWeek', 'DaysBetween', 'DaysInAMonth', 'DaysInAYear', 'DaySpan', 'DegToRad', 'DeleteFile', 'DiskFree', 'DiskSize',
      'DupeString', 'EncodeDate', 'EncodeDateTime', 'EncodeTime', 'EndOfADay', 'EndOfAMonth', 'Eof', 'Eoln', 'Exp', 'ExtractFileDir',
      'ExtractFileDrive', 'ExtractFileExt', 'ExtractFileName', 'ExtractFilePath', 'FahrenheitToCelsius', 'FileAge',
      'FileDateToDateTime', 'FileExists', 'FilePos', 'FileSearch', 'FileSetDate', 'FileSize', 'FindClose', 'FindCmdLineSwitch',
      'FindFirst', 'FindNext', 'FloatToStr', 'FloatToStrF', 'Format', 'FormatCurr', 'FormatDateTime', 'FormatFloat', 'Frac',
      'GetCurrentDir', 'GetLastError', 'GetMem', 'High', 'IncDay', 'IncMinute', 'IncMonth', 'IncYear', 'InputBox',
      'InputQuery', 'Int', 'IntToHex', 'IntToStr', 'IOResult', 'IsInfinite', 'IsLeapYear', 'IsMultiThread', 'IsNaN',
      'LastDelimiter', 'Length', 'Ln', 'Lo', 'Log10', 'Low', 'LowerCase', 'Max', 'Mean', 'MessageDlg', 'MessageDlgPos',
      'MonthOfTheYear', 'Now', 'Odd', 'Ord', 'ParamCount', 'ParamStr', 'Pi', 'Point', 'PointsEqual', 'Pos', 'Pred',
      'Printer', 'PromptForFileName', 'PtInRect', 'RadToDeg', 'Random', 'RandomRange', 'RecodeDate', 'RecodeTime', 'Rect',
      'RemoveDir', 'RenameFile', 'Round', 'SeekEof', 'SeekEoln', 'SelectDirectory', 'SetCurrentDir', 'Sin', 'SizeOf',
      'Slice', 'Sqr', 'Sqrt', 'StringOfChar', 'StringReplace', 'StringToWideChar', 'StrToCurr', 'StrToDate', 'StrToDateTime',
      'StrToFloat', 'StrToInt', 'StrToInt64', 'StrToInt64Def', 'StrToIntDef', 'StrToTime', 'StuffString', 'Succ', 'Sum', 'Tan',
      'Time', 'TimeToStr', 'Tomorrow', 'Trunc', 'UpCase', 'UpperCase', 'VarType', 'WideCharToString', 'WrapText', 'Yesterday',
      'Append', 'AppendStr', 'Assign', 'AssignFile', 'AssignPrn', 'Beep', 'BlockRead', 'BlockWrite', 'Break',
      'ChDir', 'Close', 'CloseFile', 'Continue', 'DateTimeToString', 'Dec', 'DecodeDate', 'DecodeDateTime',
      'DecodeTime', 'Delete', 'Dispose', 'EndThread', 'Erase', 'Exclude', 'Exit', 'FillChar', 'Flush', 'FreeAndNil',
      'FreeMem', 'GetDir', 'GetLocaleFormatSettings', 'Halt', 'Inc', 'Include', 'Insert', 'MkDir', 'Move', 'New',
      'ProcessPath', 'Randomize', 'Read', 'ReadLn', 'ReallocMem', 'Rename', 'ReplaceDate', 'ReplaceTime',
      'Reset', 'ReWrite', 'RmDir', 'RunError', 'Seek', 'SetLength', 'SetString', 'ShowMessage', 'ShowMessageFmt',
      'ShowMessagePos', 'Str', 'Truncate', 'Val', 'Write', 'WriteLn'
      ),
    4 => array(
      'AnsiChar', 'AnsiString', 'Boolean', 'Byte', 'Cardinal', 'Char', 'Comp', 'Currency', 'Double', 'Extended',
      'Int64', 'Integer', 'LongInt', 'LongWord', 'PAnsiChar', 'PAnsiString', 'PChar', 'PCurrency', 'PDateTime',
      'PExtended', 'PInt64', 'Pointer', 'PShortString', 'PString', 'PVariant', 'PWideChar', 'PWideString',
      'Real', 'Real48', 'ShortInt', 'ShortString', 'Single', 'SmallInt', 'String', 'TBits', 'TConvType', 'TDateTime',
      'Text', 'TextFile', 'TFloatFormat', 'TFormatSettings', 'TList', 'TObject', 'TOpenDialog', 'TPoint',
      'TPrintDialog', 'TRect', 'TReplaceFlags', 'TSaveDialog', 'TSearchRec', 'TStringList', 'TSysCharSet',
      'TThreadFunc', 'Variant', 'WideChar', 'WideString', 'Word'
      ),
                
    ),
  'CASE_SENSITIVE' => array(
    GESHI_COMMENTS => true,
      1 => false,
      2 => false,
      3 => false,
      4 => false,
    ),
  'STYLES' => array(
    'KEYWORDS' => array(
      1 => 'color: #000000; font-weight: bold;',
      2 => 'color: #000000; font-weight: bold;',
      3 => 'color: #000000;',
      4 => 'color: #000000;',
      5 => 'color: #C0C0C0;'
      ),
    'COMMENTS' => array(
      1 => 'color: #808080; font-style: italic;',
      'MULTI' => 'color: #808080; font-style: italic;'
      ),
    'ESCAPE_CHAR' => array(
      ),
    'BRACKETS' => array(
      0 => 'color: #000000;'
      ),
    'STRINGS' => array(
      0 => 'color: #ff0000;'
      ),
    'NUMBERS' => array(
      0 => 'color: #0000ff;'
      ),
    'METHODS' => array(
      1 => 'color: #000000;'
      ),
    'REGEXPS' => array(
                0 => 'color: #0000ff;',
                1 => 'color: #ff0000;',
                2 => 'color: #800080; font-weight: bold;'
      ),
    'SYMBOLS' => array(
      0 => 'color: #000000;'
      ),
    'SCRIPT' => array(
      )
    ),
  'URLS' => array(
    1 => '',
    2 => '',
    3 => '',
    4 => ''
    ),
  'OOLANG' => true,
  'OBJECT_SPLITTERS' => array(
    1 => '.'
    ),
  'REGEXPS' => array(
          0 => '\$[0-9a-fA-F]+',
          1 => '\#\$?[0-9]{1,3}',
          2 => array(
                 GESHI_SEARCH => '(\asm)([a-z]+)(end;)', 
                 GESHI_REPLACE => '\\2',            
                 GESHI_MODIFIERS => '',             
                 GESHI_BEFORE => '\\1',             
                 GESHI_AFTER => '\\3'              
          )
    ),
  'STRICT_MODE_APPLIES' => GESHI_NEVER,
  'SCRIPT_DELIMITERS' => array(
    ),
  'HIGHLIGHT_STRICT_BLOCK' => array(
    )
);
 
?>
 
 
Delphi code snippet:
procedure TForm1.Button1Click(Sender:TObject);
var
  Number, I, X: Integer;
begin
  Number := 12356;
  Caption := 'The number is ' + IntToStr(Number);
  for I := 0 to Number do
  begin
    Inc(X);
    Dec(X);
    X := X + 1.0;
    ListBox1.Items.Add(IntToStr(X));
  end;
  asm
    MOX AX, 1234H
    MOV Number, AX
  end;
end;
                                              

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