这样的事情应该做到：
string val = "name='40474740-1e40-47ce-aeba-ebd1eb1630c0'";
Match match = Regex.Match(val, @"'([^']*)");
if (match.Success)
{
string yourValue = match.Groups[1].Value;
Console.WriteLine(yourValue);
}
表达式说明'([^']*)：
' -> find a single quotation mark
( -> start a matching group
[^'] -> match any character that is not a single quotation mark
* -> ...zero or more times
) -> end the matching group
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