how to use regex class for string maniplations

Question

I am working on string maniplations using regex.

   Source: string value = @"/webdav/MyPublication/Building%20Blocks/folder0/folder1/content_1.xml";

   output required:
           Foldername: folder1
           content name: content
           folderpath:/webdav/MyPublication/Building%20Blocks/folder0/folder1/

I am new to this, can any one say how it can be done using regex. Thank you.

Could you describe the rules you want to use in words? An example can be interpreted in various ways. Also, what have you tried? — svick, Mar 28 '12 at 14:18

score 0 · Answer 1 · edited May 23 '17 at 12:20

0

You could use named captures, but you're probably better off (from a security and implementation aspect) just using the Uri class.

edited May 23 '17 at 12:20

Community

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answered Mar 28 '12 at 14:21

Jeff Moser

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PinnyM · Accepted Answer · 2012-03-29T14:54:18.163

The rules you need seem to be the following:

Folder name = last string preceding a '/' character but not containing a '/' character
content name = last string not containing a '/' character until (but not including) a '_' or '.' character
folderpath = same as folder name except it can contain a '/' character

Assuming the rules above - you probably want this code:

string value = @"/webdav/MyPublication/Building%20Blocks/folder0/folder1/content_1.xml";

var foldernameMatch = Regex.Match(value, @"([^/]+)/[^/]+$");
var contentnameMatch = Regex.Match(value, @"([^/_\.]+)[_\.][^/]*$");
var folderpathMatch = Regex.Match(value, @"(.*/)[^/]*$");
if (foldernameMatch.Success && contentnameMatch.Success && folderpathMatch.Success)
{
    var foldername = foldernameMatch.Groups[1].Value;
    var contentname = contentnameMatch.Groups[1].Value;
    var folderpath = folderpathMatch.Groups[1].Value;
}
else
{
  // handle bad input
}

Note that you can also combine these to become one large regex, although it can be more cumbersome to follow (if it weren't already):

var matches = Regex.Match(value, @"(.*/)([^/]+)/([^/_\.]+)[_\.][^/]*$");
if (matches.Success)
{
    var foldername = matches.Groups[2].Value;
    var contentname = matches.Groups[3].Value;
    var folderpath = matches.Groups[1].Value + foldername + "/";
}
else
{
    // handle bad input
}

Thank you Pinny. The content may or may not contain a '_'. If it contains, i need to remove it, or else have to take the name as it is. — Patan, Mar 28 '12 at 17:45
If it doesn't contain an underscore - e.g. 'content.xml' do you need to take the whole name or until the '.' character? — PinnyM, Mar 28 '12 at 18:01

Richard · Answer 3 · 2012-03-28T14:50:29.710

I agree with Jeff Moser on this one, but to answer the original question, I believe the following regular expression would work: ^(\/.+\/)(.+?)\/(.+?)\.

edit: Added example.

var value = "/webdav/MyPublication/Building%20Blocks/folder0/folder1/content_1.xml";
var regex = Regex.Match(value, @"^(\/.+\/)(.+?)\/(.+?)\.");

// check if success
if (regex.Success)
{
    // asssign the values from the regular expression
    var folderName = regex.Groups[2].Value;
    var contentName = regex.Groups[3].Value;
    var folderPath = regex.Groups[1].Value;
}

how to use regex class for string maniplations

3 Answers3