How to match correct group name(.NET C# Regex)

Question

I need to get some information form a string, and I want to use group name to get information, but I can't do a correct result.

My Code

Regex _Regex = new Regex(@"\AFilePath: (?<FilePath>.+), ContentType: (?<ContentType>.+)[, PrinterName: ]? (?<PrinterName>.+),DownloadFileName: (?<DownloadFileName>.+)\z");
    string _String = @"FilePath: C:\Download\TEST.docx, ContentType: WORD, PrinterName: RICOH Aficio MP C4501 PCL 6, DownloadFileName: TEST.docx";
    Match _Match = _Regex.Match(_String);
    if (_Match.Success == true)
{
  string FileNme = _Match.Groups["FilePath"].Value;
  string ContentType = _Match.Groups["ContentType"].Value;
  string PrinterName = _Match.Groups["PrinterName"].Value;
  string DownloadFileName = _Match.Groups["DownloadFileName"].Value;
}

I expect I can get FileNme, CreateTime, PrinterName, DownloadFileName information by the Regex, like this:

FileNme = "C:\Download\TEST.docx"
ContentType = "WORD"
PrinterName = "RICOH Aficio MP C4501 PCL 6"
DownloadFileName = "TEST.docx"

But actually, result with this regex is like this

FileNme = "C:\Download\TEST.docx"
ContentType = "WORD, PrinterName:  RICOH Aficio MP C4501 PCL"
PrinterName = "6"
DownloadFileName = "TEST.docx"

Wiktor Stribiżew · Accepted Answer · 2019-09-04 07:35:28Z

1

You may use

\AFilePath:\s*(?<FilePath>.*?),\s*ContentType:\s*(?<ContentType>.*?),\s*PrinterName:\s*(?<PrinterName>.*?),\s*DownloadFileName:\s*(?<DownloadFileName>.+)\z

See the regex demo

Basically, all parts of the regex represent some hardcoded string (like FilePath:), then 0+ whitespaces (matched with \s*) and then a named capturing group (like (?<FilePath>.*?)) that capture any 0+ chars other than a newline, as few times as possible (instead of the last one where the greedy dot pattern is required, .+ or .*).

If the printer name part can be missing you need to enclose ,\s*PrinterName:\s*(?<PrinterName>.*?) with (?:...)?, i.e. (?:,\s*PrinterName:\s*(?<PrinterName>.*?))?.

answered Sep 4, 2019 at 7:35

Wiktor Stribiżew

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