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How to find a string that is delimited by a certain start and end character
string testingString = "stack $over| flow $stack| exchange";
var pattern = @"(?$.*?|)"; // also tried @"$[^|]|"
foreach (var m in System.Text.RegularExpressions.Regex.Split(testingString, pattern)) {
    Response.Write(m );
}
// output == stack $over| flow $stack| exchange

string testingString = @"stack $over| flow $stack| exchange";

MatchCollection result = Regex.Matches
    (testingString,
            @"
                (?<=$)  # This is a lookbehind, it ensure there is a $ before the string
                [^|]*    # Match any character that is not a |
                (?=|)   # This is a lookahead,it ensures that a | is ahead the pattern
            "
            , RegexOptions.IgnorePatternWhitespace);

foreach (Match item in result) {
    Console.WriteLine(item.ToString());
}

Regex t = new Regex(@"$([^|]+)|");
MatchCollection allMatches = t.Matches("stack $over| flow $stack| exchange");