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Full Discussion: Bash regex evaluation not workin
Top Forums Shell Programming and Scripting Bash regex evaluation not workin Post 302968298 by lramirev on Monday 7th of March 2016 05:30:04 PM
Old 03-07-2016
Bash regex evaluation not workin
I'm building a script that may received start and end date as parameters. I whant to make it as flexible as possible so I'm accepting epoch and date in a way that "date --date=" command may accept. In order to know if parameter provided is an epoc or a "date --date=" string I evaluate if the value is a number. For this a built a function:

Code:
function isNumber ()
{ [[ "$1" =~ "^[0-9]+$" ]] && echo true || echo false
}

The intended use of the funtion is as following

Code:
while getopts :e:F:G:hmo:r:s:vZ dOpts
do
        case $dOpts in
        "e")    if $(isNumber "$OPTARG")
                then
                        dEnd="$OPTARG"
                else
                        dEnd=$(date --date="$OPTARG" +%s)
                fi
                ;;
        "s")    if $(isNumber "$OPTARG")
                then
                        dStart="$OPTARG"
                else
                        dStart=$(date --date="$OPTARG" +%s)
                fi
                ;;
        esac
done
shift $((OPTIND-1))

I'm running on:
Code:
# cat /proc/version
Linux version 2.6.32-279.19.1.el6.x86_64 (mockbuild@x86-001.build.bos.redhat.com) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Sat Nov 24 14:35:28 EST 2012

And my bash version is:
Code:
# rpm -qa bash
bash-4.1.2-9.el6_2.x86_64

Every time I evaluate the function it returns false. I made this test on my console and it do return false every time.

Code:
# isNumber e-1month
false
# isNumber 1420088400
false
# [[ 1420088400 =~ '[0-9].' ]] && echo true || echo false
false
# [[ 1420088400 =~ '[0-9]+' ]] && echo true || echo false
false
# [[ "1420088400" =~ '^[0-9]+$' ]] && echo true || echo false
false

What I'm I doing wrong with this redex evaluation? I'm I missing an option on bash? This is my invocation line of the script
Code:
#!/bin/bash

Thank you for attention to this message.
 

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LEARN ABOUT MINIX

date

DATE(1) 						      General Commands Manual							   DATE(1)

NAME

       date - print or set the date and time

SYNOPSIS

       date [-qsu] [[MMDDYY]hhmm[ss]] [+format]

OPTIONS

       -q     Read the date from stdin

       -s     Set the time (implicit for -q or a date string)

       -u     Print the date as GMT

       -t     Use this number of seconds instead of current time

EXAMPLES

       date		   # Print the date and time

       date 0221921610	   # Set date to Feb 21, 1992 at 4:10 p.m.

DESCRIPTION

       With  the  -q flag or a numeric argument, date sets the GMT time and date.  MMDDYY refers to the month, day, and year; hhmmss refers to the
       hour, minute and second.  Each of the six fields must be exactly two digits, no more and no less.  date always display the date	and  time,
       with  the  default format for the system.  The -u flag request GMT time instead of local time.  A format may be specified with a + followed
       by a printf-like string with the following options:

	 %%  % character
	 %A  Name of the day
	 %B  Name of the month
	 %D  mm/dd/yy
	 %H  Decimal hour on 2 digits
	 %I  Decimal hour modulo 12 on 2 digits
	 %M  Decimal minute on 2 digits
	 %S  Decimal seconds on 2 digits
	 %T  HH:MM:SS
	 %U  Decimal week number, Sunday being first day of week
	 %W  Decimal week number, Monday being first day of week
	 %X  Same as %T
	 %Y  Decimal year on 4 digits
	 %Z  Time Zone (if any)
	 %a  Abbreviated name of the day
	 %b  Abbreviated name of the month
	 %c  Appropriate date & time (default format)
	 %d  Decimal day of the month on 2 digits
	 %e  Same as %d, but a space replaces leading 0
	 %h  Same as %b
	 %j  Decimal dey of the year on 3 digits
	 %m  Decimal month on 2 digits
	 %n  Newline character
	 %p  AM or PM
	 %r  12-hour clock time with AM/PM
	 %s  Number of seconds since the epoch
	 %t  Tab character
	 %w  Decimal day of the week (0=Sunday)
	 %x  Same as %D
	 %y  Decimal year on 2 digits

SEE ALSO

       time(2), ctime(3), readclock(8).

																	   DATE(1)
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