regex - How to get substring with pattern using Java -


i have file containing records below:

drwxr-xr-x   - root supergroup          0 2015-04-05 05:26 /user/root drwxr-xr-x   - hadoop supergroup          0 2014-11-05 11:56 /user/root/input drwxr-xr-x   - hadoop supergroup          0 2014-11-05 03:06 /user/root/input/foo drwxr-xr-x   - hadoop supergroup          0 2015-04-28 03:06 /user/root/input/foo/bar drwxr-xr-x   - hadoop supergroup          0 2013-11-06 15:54 /user/root/input/foo/bar/20120706 -rw-r--r--   3 hadoop supergroup          0 2013-11-06 15:54 /user/root/input/foo/bar/20120706/_success drwxr-xr-x   - hadoop supergroup          0 2013-11-06 15:54 /user/root/input/foo/bar/20120706/_logs drwxr-xr-x   - hadoop supergroup          0 2013-11-06 15:54 /user/root/input/foo/bar/20120706/_logs/history

in java code, use pattern , matcher class substrings want process later. code in listing:

string filename = "d:\\temp\\files_in_hadoop_temp.txt"; pattern thepattern     = pattern.compile("[a-z\\-]+\\s+(\\-|[0-9]) (root|hadoop)\\s+supergroup\\s+([0-9]+) ([0-9\\-]+) ([0-9:]+) (\\d+)\\/?.*");      try     {         files.lines(paths.get(filename))                 .map(line -> thepattern.matcher(line))                 .collect(collectors.tolist())                 .foreach(themather -> {                     if (themather.find())                     {                         system.out.println(themather.group(3) + "-" + themather.group(4) + "-" + themather.group(6));                     }                 });     } catch (ioexception e)     {         e.printstacktrace();     }

and result below:

0-2015-04-05-/user/root 0-2014-11-05-/user/root/input 0-2014-11-05-/user/root/input/foo 0-2015-04-28-/user/root/input/foo/bar 0-2013-11-06-/user/root/input/foo/bar/ 0-2013-11-06-/user/root/input/foo/bar/ 0-2013-11-06-/user/root/input/foo/bar/ 0-2013-11-06-/user/root/input/foo/bar/

but expected results without tailing "/" first 3 rows. have tried many patterns strip tailing "/" failed.

would please provide suggestions pattern strip tailing "/".

thank lot.

use character set make sure last character isn't slash. thus, instead of 

(\\d+)\\/?.*"

try

(\\d*[^\\d/]).*

the part in parentheses matches longest substring of nondigits, added restriction last character may not slash.

note: tested.


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