I'm a little naive about regex's so this might not be completely coherent.  

I have a input string containing keywords (<KEY>/) and values (mostly terminated by a period).  Some keywords are optional.  I have cookbooked a series of regex's using named groups (see below) that when each run individually find the value and assign it to the group successfully.  However, I'm looking for a way to create a single regex and run them all simultaneously so that when the input is run in a .Net application results in a collection of Match Groups with a value.  Concatenating the regex's does not seem to work or using the OR operator ("|").

 Input Sample (linefeeds included):

Regex's:

(?<License>(?<=(?:LIC/))\w{5,6}(?=(?:\s|\Z|\.)))
(?<LicYr>(?<=(?:LIY/)).*?.(?=(?:\Z|\.)))
(?<Name>(?<=(?:NAM/)).*?.(?=(?:\Z|\.)))
(?<Address>(?<=(?:SNM/)).*?.(?=(?:\Z|\.)))
(?<City>(?<=(?:CTY?/)).*?.(?=(?:\Z|\.)))
(?<State>(?<=(?:STA?/)).*?.(?=(?:\Z|\.)))
(?<Zip>(?<=(?:Zip?/)).*?.(?=(?:\Z|\.)))
(?<Year>(?<=(?:VYR?/)).*?.(?=(?:\Z|\.)))
(?<Make>(?<=(?:VMA?/)).*?.(?=(?:\Z|\.)))
(?<Model>(?<=(?:VMO?/)).*?.(?=(?:\Z|\.|\s{2})))
(?<Dob>(?<=(?:DOB?/)).*?.(?=(?:\Z|\.)))
(?<Sex>(?<=(?:SEX?/)).*?.(?=(?:\Z|\.)))
(?<Hgt>(?<=(?:HGT?/)).*?.(?=(?:\Z|\.)))
(?<Wgt>(?<=(?:WGT?/)).*?.(?=(?:\Z|\.)))
(?<Eye>(?<=(?:EYE?/)).*?.(?=(?:\Z|\.)))
(?<Oln>(?<=(?:OLN?/)).*?.(?=(?:\Z|\.)))

It should work with concatenating with OR (|)

(?x)

(?<License>(?<=(?:LIC/))\w{5,6}(?=(?:\s|\Z|\.))) |
(?<LicYr>(?<=(?:LIY/)).*?.(?=(?:\Z|\.))) |
(?<Name>(?<=(?:NAM/)).*?.(?=(?:\Z|\.)))  |

..........

Thanks - this sort of works, however I get a a lot of matches in the match collection of which only one is a real match.  I can hunt for it, but it's fairly inefficient: 

        string path = "Storage Card";

        public static Regex rx = new Regex(
      "(?<License>(?<=(?:LIC/))\\w{5,6}(?=(?:\\s|\\Z|\\.)))|\r\n(?<Li" +
      "cYr>(?<=(?:LIY/)).*?.(?=(?:\\Z|\\.)))|\r\n(?<Name>(?<=(?:NAM/)" +
      ").*?.(?=(?:\\Z|\\.)))|\r\n(?<Address>(?<=(?:SNM/)).*?.(?=(?:\\Z" +
      "|\\.)))|\r\n(?<City>(?<=(?:CTY?/)).*?.(?=(?:\\Z|\\.)))|\r\n(?<St" +
      "ate>(?<=(?:STA?/)).*?.(?=(?:\\Z|\\.)))|\r\n(?<Zip>(?<=(?:Zip?/" +
      ")).*?.(?=(?:\\Z|\\.)))|\r\n(?<Make>(?<=(?:VMO?/)).*?.(?=(?:\\Z" +
      "|\\.|\\s{2})))|\r\n(?<Year>(?<=(?:VYR?/)).*?.(?=(?:\\Z|\\.)))|" +
      "\r\n(?<Dob>(?<=(?:DOB?/)).*?.(?=(?:\\Z|\\.)))|\r\n(?<Sex>(?<=(?:" +
      "SEX?/)).*?.(?=(?:\\Z|\\.)))|\r\n(?<Hgt>(?<=(?:HGT?/)).*?.(?=(?" +
      ":\\Z|\\.)))|\r\n(?<Wgt>(?<=(?:WGT?/)).*?.(?=(?:\\Z|\\.)))|\r\n(?" +
      "<Eye>(?<=(?:EYE?/)).*?.(?=(?:\\Z|\\.)))|\r\n(?<Oln>(?<=(?:OLN?" +
      "/)).*?.(?=(?:\\Z|\\.)))",
    RegexOptions.IgnoreCase
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );
            foreach (string file in Directory.GetFiles(path))
            {
                // Get file stream
                StreamReader stream = File.OpenText(file);
                string text = stream.ReadToEnd();
                stream.Close();

                // Find matches
                MatchCollection matches = rx.Matches(text);

                string[] groupNames = rx.GetGroupNames();

                // Find the named group with a non-empty value in the match collection
                foreach (string name in groupNames)
                {
                    // Ignore the default group
                    if (name == "0")
                        continue;
                    foreach (Match match in matches)
                    {
                        if (match.Groups[name].Value != String.Empty)
                        {
                            string value = match.Groups[name].Value;
                            // Do something with the value here.....
                        }
                    }
                }
            }
        }

Here's I would do this in PHP (if my simplified rules match the data):

<?php
$string='TO:      CRZ-01491287 20061118 14:39:45 1C6216C157
FROM: A36MPQ41-04610686 20061118 14:39:44 1C6205C461

TXT                                                                 
LIC/NBC123. LIY/07. LIT/PC.                                                  
NAM/AMBERG,AMANDA SUE.*RECORD DISSEMINATION RESTRICTED*                     
SNM/56528 ROCK  POINT  ROAD. CTY/PACOMIA. STA/MN. ZIP/90457.            
VIN/2T1CE22P63C014569. VYR/03. VMA/TOYT.                                     
VMO/CAMRY SOLARA SE,COUPE                                                    
EXM/AUG. DOB/19590515. STICKER:402208. ';

//create the $matches array
preg_match_all('#(\w+)/([^.\r]+)#',$string,$matches);

//create result array from capture groups
$result = array_combine($matches[1],$matches[2]);

//print result array
echo "<pre>".print_r($result,true);
?>

Here's the result:

Array
(
    [LIC] => NBC123
    [LIY] => 07
    [LIT] => PC
    [NAM] => AMBERG,AMANDA SUE
    [SNM] => 56528 ROCK  POINT  ROAD
    [CTY] => PACOMIA
    [STA] => MN
    [ZIP] => 90457
    [VIN] => 2T1CE22P63C014569
    [VYR] => 03
    [VMA] => TOYT
    [VMO] => CAMRY SOLARA SE,COUPE                                                     
    [EXM] => AUG
    [DOB] => 19590515
)