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Full Discussion: finding date numeral from file and check the validity of date format
Top Forums Shell Programming and Scripting finding date numeral from file and check the validity of date format Post 302574333 by Klashxx on Thursday 17th of November 2011 05:53:50 AM
Old 11-17-2011
If perl is ok, this is the equivalent for the dates:
Code:
 perl -n -e '/(\d+-*\d*-*\d*)/;print $1."\n";' file

And for the validation, you can star with:
Code:
#!/usr/bin/env ksh

validaF ()
{
fecha="${1}"

echo "${fecha}"|perl -n -e '
   if ( m!^((?:19|20)\d\d)(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01])$!) {
      # $1 -> anyo  $2 -> mes , $3 -> dia
      if ($3 == 31 and ($2 == 4 or $2 == 6 or $2 == 9 or $2 == 11)) {
         print "0" ; # Meses con 30 dias
         }
      elsif ($3 >= 30 and $2 == 2) {
         print "0" ; # Febrero nunca 30 o 31
         } 
      elsif ($2 == 2 and $3 == 29 and not ($1 % 4 == 0 and ($1 % 100 != 0 or $1 % 400 == 0))) {
         print "0" ; # 29 de Febrero cuando no es bisiesto
         } 
      else {
         print "Correct date !: $_ \n"; # Fecha valida
         }
      } 
    else {
       print "KO: $_" ; # Sin formato de fecha
    }'
}

validaF 20110811
validaF 20110841

Of course you need to adapt the regex to match the rest of the date formats.
 

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LEARN ABOUT MOJAVE

perlivp5.18

PERLIVP(1)						 Perl Programmers Reference Guide						PERLIVP(1)

NAME

       perlivp - Perl Installation Verification Procedure

SYNOPSIS

       perlivp [-p] [-v] [-h]

DESCRIPTION

       The perlivp program is set up at Perl source code build time to test the Perl version it was built under.  It can be used after running:

	   make install

       (or your platform's equivalent procedure) to verify that perl and its libraries have been installed correctly.  A correct installation is
       verified by output that looks like:

	   ok 1
	   ok 2

       etc.

OPTIONS

       -h help
	    Prints out a brief help message.

       -p print preface
	    Gives a description of each test prior to performing it.

       -v verbose
	    Gives more detailed information about each test, after it has been performed.  Note that any failed tests ought to print out some
	    extra information whether or not -v is thrown.

DIAGNOSTICS

       o   print "# Perl binary '$perlpath' does not appear executable.
";

	   Likely to occur for a perl binary that was not properly installed.  Correct by conducting a proper installation.

       o   print "# Perl version '$]' installed, expected $ivp_VERSION.
";

	   Likely to occur for a perl that was not properly installed.	Correct by conducting a proper installation.

       o   print "# Perl @INC directory '$_' does not appear to exist.
";

	   Likely to occur for a perl library tree that was not properly installed.  Correct by conducting a proper installation.

       o   print "# Needed module '$_' does not appear to be properly installed.
";

	   One of the two modules that is used by perlivp was not present in the installation.	This is a serious error since it adversely affects
	   perlivp's ability to function.  You may be able to correct this by performing a proper perl installation.

       o   print "# Required module '$_' does not appear to be properly installed.
";

	   An attempt to "eval "require $module"" failed, even though the list of extensions indicated that it should succeed.	Correct by
	   conducting a proper installation.

       o   print "# Unnecessary module 'bLuRfle' appears to be installed.
";

	   This test not coming out ok could indicate that you have in fact installed a bLuRfle.pm module or that the "eval " require
	   "$module_name.pm"; "" test may give misleading results with your installation of perl.  If yours is the latter case then please let
	   the author know.

       o   print "# file",+($#missing == 0) ? '' : 's'," missing from installation:
";

	   One or more files turned up missing according to a run of "ExtUtils::Installed -> validate()" over your installation.  Correct by
	   conducting a proper installation.

       For further information on how to conduct a proper installation consult the INSTALL file that comes with the perl source and the README
       file for your platform.

AUTHOR

       Peter Prymmer

perl v5.18.2							    2018-08-17								PERLIVP(1)
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