regex - java regular expression for parsing log file -

i trying parse log file, , want extract parameters lines entered. here example, line:

"apr  8 07:13:10 kali gnome-screensaver-dialog: gkr-pam: unlocked login keyring" 

the program gives me:

date&time: apr 11 00:06:30 hostname: kali program name: gnome-screensaver-dialog log: gkr-pam: unlocked login keyring 

but line:

"apr  8 07:13:45 kali gnome-screensaver-dialog: pam_unix(gnome-screensaver:auth): authentication failure; logname= uid=0 euid=0 tty=:0.0 ruser= rhost=  user=root" 

i have error java. error "regular expression not matching", code, indicates reges bogus. basically, want extract date&time, hostname, program name, , log message problem @ extracting program name, first thing before first colon, example line above should give me:

   date&time: apr  8 07:13:45     hostname: kali     program name: gnome-screensaver-dialog     log: pam_unix(gnome-screensaver:auth): authentication failure; logname= uid=0 euid=0 tty=:0.0 ruser= rhost=  user=root 

here partial java code:

private class filetailerlisteneradapter extends tailerlisteneradapter {         @override         public void handle(string line) {             string logentrypattern = "([\\w]+\\s[\\d]+\\s[\\d:]+) ([\\w]+) ([\\[\\]\\(\\)a-za-z0-9\\-]+)[?:] (.+)";             pattern p = pattern.compile(logentrypattern);             matcher matcher = p.matcher(line);              if (!matcher.matches()) {                 system.err.println("regular expression not matching:");                 system.err.println(line);                 return;             }             system.out.println("total groups: " + matcher.groupcount());             system.out.println("date&time: " + matcher.group(1));             system.out.println("hostname: " + matcher.group(2));             system.out.println("program name: " + matcher.group(3));             system.out.println("log: " + matcher.group(4));             system.out.println();             system.out.println();         }     } 

any appreciated!

it seems hostname , program name cannot contain spaces - knowing can simplify regexp lot: separate hostname, program name , log message using whitespace characters - , work:

final string logentrypattern = "(\\w+\\s+\\d+\\s+\\d{2}:\\d{2}:\\d{2})\\s+(\\s+)\\s+(\\s+):\\s+(.+)"; final pattern p = pattern.compile(logentrypattern); final matcher matcher = p.matcher(line);  if (!matcher.matches()) {     system.err.println("regular expression not matching:");     system.err.println(line);     return; } system.out.println("total groups: " + matcher.groupcount()); system.out.println("date&time: " + matcher.group(1)); system.out.println("hostname: " + matcher.group(2)); system.out.println("program name: " + matcher.group(3)); system.out.println("log: " + matcher.group(4));