Regular expression to validate windows and linux path with extension

Question

I am trying to write a function which will validate weather the given path is valid in Linux/Windows with file extension.

ex:

Windows path: D:\DATA\My_Project\01_07_03_061418738709443.doc
Linux path: /source_data/files/08_05_09_1418738709443.pdf

The code that I have tried is

static String REMOTE_LOCATION_WIN_PATTERN = "([a-zA-Z]:)?(\\\\[a-z  A-Z0-9_.-]+)+.(txt|gif|jpg|png|jpeg|pdf|doc|docx|xls|xlsx|DMS)\\\\?";

static String REMOTE_LOCATION_LINUX_PATTERN = "^(/[^/]*)+.(txt|gif|jpg|png|jpeg|pdf|doc|docx|xls|xlsx|DMS)/?$";

public boolean checkPathValidity(String filePath) {

   Pattern linux_pattern = Pattern.compile(REMOTE_LOCATION_LINUX_PATTERN);
   Pattern win_pattern = Pattern.compile(REMOTE_LOCATION_WIN_PATTERN);
   Matcher m1 = linux_pattern.matcher(filePath);
   Matcher m2 = win_pattern.matcher(filePath);

   if (m1.matches() || m2.matches()) {
      return true;
   } else {
      return false;
   }
}

This function gives result true if path is valid in either windows/linux. The above function is not returning right result for some of the paths that contain dates, _ ? , * in their path.

Reaganreagen

Is this even worth doing? You’ll get an exception on the remote side, whether the file has invalid characters, or the file has valid characters but refers to a nonexistent or inaccessible path. For instance, "/root/08_05_09.pdf" would pass a regex check, but probably would fail whatever operation your application is doing. So there will be a check for validity on the remote side regardless. – Tepic

These validation will get executed on client side itself. the I am just configuring the checkPathValidity() method according to remote side. – Reaganreagen

Answer 1

static String REMOTE_LOCATION_WIN_PATTERN = "([a-zA-Z]:)?(\\\\[a-z  A-Z0-9_.-]+)+.(txt|gif|jpg|png|jpeg|pdf|doc|docx|xls|xlsx|DMS)\\\\?";

static String REMOTE_LOCATION_LINUX_PATTERN = "^(/[^/]*)+.(txt|gif|jpg|png|jpeg|pdf|doc|docx|xls|xlsx|DMS)/?$";

static Pattern linux_pattern = Pattern.compile(REMOTE_LOCATION_LINUX_PATTERN);
static Pattern win_pattern = Pattern.compile(REMOTE_LOCATION_WIN_PATTERN);

static final boolean WINDOWS = System.getProperty("os.name").startsWith("Windows");


public boolean checkPathValidity(String filePath) {
   Matcher m = WINDOWS ? win_pattern.matcher(filePath) : linux_pattern.matcher(filePath);

   return m.matches();    
}

Chian

I have tried path G:\DATA\GREEN_DOC\MyCab\index\16_12_06_05_09_1418738709443F.DOC . It's not working – Reaganreagen

I know that is what my question is about. I need a regular expression that will validate the file paths on windows and linux system – Reaganreagen

Answer 2

You can basically combine the two patterns as follows:

1. windows: [a-zA-Z]:\\(?:([^<>:"\/\\|?*]*[^<>:"\/\\|?*.]\\|..\\)*([^<>:"\/\\|?*]*[^<>:"\/\\|?*.]\\?|..\\))?
2. linux: \/.*
3. total: (\/.*|[a-zA-Z]:\\(?:([^<>:"\/\\|?*]*[^<>:"\/\\|?*.]\\|..\\)*([^<>:"\/\\|?*]*[^<>:"\/\\|?*.]\\?|..\\))?)

This works fine on my angular input tag pattern validation.

Check the ling for more details How would I match a pattern for both windows and Linux directory path?

Dafna