Java: Regular Expression for FTP server list?

Question

I'm writing FTP client handler in Java and I can't use FTP libraries like Apache.

My problem is that I receive the list from the server in this format:

drw-rw-rw- 1 ftp ftp                0 Mar 17 06:10 Tor Browser
-rw-rw-rw- 1 ftp ftp          1538814 Jun 26 00:23 setup.exe
-rw-rw-rw- 1 ftp ftp           142570 May 24 05:28 satellite A665-S6086.pdf

While all I need is the file/directory name and size.

Please suggest me a way to reduce the list to names and sizes, keeping in mind spacing differences between the columns and spacing in the filenames.

Thank you all in advance :)

Why do you undo all my edits? I tried to make it more readable. — nhahtdh, Jul 02 '12 at 02:25
Sorry, I was actually editing my post after posting it so there might be some conflict but I still can see your edits.. thanks — user1494975, Jul 02 '12 at 06:23

score 0 · Accepted Answer · answered Jul 02 '12 at 02:17

0

Since you just want to grab the data, you can use this regex:

"(?m)^.{20}\\s*(\\d+).{14}(.*)$"

And construct a Pattern, and obtain a Matcher corresponding to the input string and start extracting matches. The size can be obtained in group(1) and the file name can be obtained in group(2).

answered Jul 02 '12 at 02:17

nhahtdh

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Thanks a lot :) for fast response and accurate answer – user1494975 Jul 02 '12 at 02:44

score 0 · Answer 2 · answered Jul 02 '12 at 02:48

Use

    Pattern sizeAndNamePattern = Pattern.compile(
            "^-.*?(\\d+) \\w{3} \\d{2} \\d{2}:\\d{2} (.*)$", Pattern.MULTILINE);

    for (Matcher matcher = sizeAndNamePattern.matcher(dirListing); matcher.find();) {
        System.out.println(matcher.group(1) + " " + matcher.group(2));
    }

If you also want to see directories, than remove the first "-" in the pattern. If performance is an issue, you should consider a more selective pattern that avoids the .*? at the beginning.

Java: Regular Expression for FTP server list?

2 Answers2