Regex expression to match command output -

filename                     eof      xxxxxxx        101           241434 12dec2011  9:33 255,255 uuuu     14     42 xxxxxxx        101           114682 12dec2013 11:49 220,0   uuuu     14     42 xxxxxxxx       101           200542 14dec2011 14:43 255,255 uuuu     14     42 xxxxxxxx       101           200458 25jan2012 15:28 220,0   nuuu     14     42 xxxxxxxx       101             8102 28jan2015 15:17 227,12  nccc     14     14 xxxxxx         101           114502 12dec2013 11:49 220,0   uuuu     14     42 xxxxxxx        101             4622 23jan2012 14:46 255,255 uuuu     14     42 xxxxxxxx       101              120 18apr2013 16:20 201,130 oooo     14     28 xxxxxx         101            48298 03jan2013  8:47  90,2   oooo     14     14 xxxxx          101           200686 07dec2011 15:59 255,255 uuuu     14     42 xxxxxxxx       101             3578 30jan2014 18:14 255,255 uuuu     14     42 

from output want match filename , eof filename only. tired \s\d+\s\d , able match eof find little challeage match filename eof

you can use :

^([\w\.]+)\s+\d+\s+(\d+) 

group 1 contain filename , group 2 contain eof

see demo

explanation:

^ anchor tells engine start of line.

\w matches word characters (alphanumeric , underscore)

\s matches whitespace character (spaces, tabs, line breaks)

\d matches digit character [0-9]

+ matches 1 or more of preceding token

\. matches dot . character

[...] character set, matches character inside set

(...) capturing group, groups inside extracting substring

so in mind can see pattern doing:

you should tell engine start of line ^ want capture first group of alphanumeric chars ([\w\.]+) here i'm assuming name of file may contain dot. if may have other characters -, should change part ([\w\.-]+) or whatever may need match.

then tell string have @ least 1 whitespace, may have more \s+. tell have @ least 1 digit, might have more \d+ (since not interested in don't put in capture group) more whitespacing \s+ more digits, these interested in capturing, put in parenthesis (\d+).

hope helps understand little more regex, cheers!