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Full Discussion: HOW TO - Bash REGEX - Print Error when More then One Occurence is Found Consecutively?
Top Forums Shell Programming and Scripting HOW TO - Bash REGEX - Print Error when More then One Occurence is Found Consecutively? Post 302716565 by mrm5102 on Tuesday 16th of October 2012 03:19:37 PM
Old 10-16-2012
HOW TO - Bash REGEX - Print Error when More then One Occurence is Found Consecutively?
Hello All,

Bash Version: 4.1.10(1)


I'm trying to "verify" some user input. The User input will contain the "Absolute Path" a "Command" and any "Options"
of that Command.

For Example, say the user's input is:
Code:
user_input="/usr//local/myExample/check_process -p 'java' -w 10 -c 20"

I can't get my REGEX Pattern below to print an error when, say for example the user accidentally inputs 2 "/" consecutively by accident...


My REGEX Pattern/Code is: *Notice the double "//" after "/usr"...
Code:
user_input="/usr//local/myExample/check_process -p 'java' -w 10 -c 20"

MY_PATTERN="((/{1,1}[[:alnum:]_-]*)+).*$"

if [[ "$user_input" =~ $MY_PATTERN ]]
 then
        echo "TRUE"
else
        echo "FALSE"
fi

So my question is how can I get this to print FALSE when the user enters a double "//"?
I thought the part of my REGEX that has "/{1,1}" would mean match one and ONLY one consecutive "/"...?

Any thoughts would be great..!

Thanks in Advance,
Matt
 

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LEARN ABOUT DEBIAN

fail2ban-regex

FAIL2BAN-REGEX(1)						   User Commands						 FAIL2BAN-REGEX(1)

NAME

       fail2ban-regex - test Fail2ban "failregex" option

SYNOPSIS

       fail2ban-regex [OPTIONS] <LOG> <REGEX> [IGNOREREGEX]

DESCRIPTION

       Fail2Ban v0.8.2 reads log file that contains password failure report and bans the corresponding IP addresses using firewall rules.

       This tools can test regular expressions for "fail2ban".

OPTIONS

       -h, --help
	      display this help message

       -V, --version
	      print the version

LOG

       string a string representing a log line

       filename
	      path to a log file (/var/log/auth.log)

REGEX

       string a string representing a 'failregex'

       filename
	      path to a filter file (filter.d/sshd.conf)

   IgnoreRegex:
       string a string representing an 'ignoreregex'

       filename
	      path to a filter file (filter.d/sshd.conf)

AUTHOR

       Written by Cyril Jaquier <cyril.jaquier@fail2ban.org>.  Many contributions by Yaroslav O. Halchenko <debian@onerussian.com>.

REPORTING BUGS

       Report bugs to <cyril.jaquier@fail2ban.org>

COPYRIGHT

       Copyright (C) 2004-2008 Cyril Jaquier
       Copyright of modifications held by their respective authors.  Licensed under the GNU General Public License v2 (GPL).

SEE ALSO

       fail2ban-client(1) fail2ban-server(1)

fail2ban-regex v0.8.2						    March 2008							 FAIL2BAN-REGEX(1)
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