Thanks Phil for useful advice. BTW I created 3 subroutines that cover most of cases in Text::Balanced What do you think ?

######################################################################
+#######
#Input file Looks Like:

#SingleLinesMultiLineFile
#START_TAG\ value1 \END_TAG
#SomeChar
#START_TAG\ value2 \END_TAG
#SomeChar
#START_TAG\ value3 \END_TAG
#SomeChar
#end SingleLinesMultiLineFile

#Usage:
#$InputFile="$LocationOfTheScriptsDirectory\\MultiLine.txt";
#$StartTag='START_TAG\\';
#$EndTag='\END_TAG';
#@AValues=getInfoFromSingleLinesMultiLineFile($InputFile,$StartTag,$En
+dTag);
#Result:@AValues=qw(value1 value2 value3);

sub getInfoFromSingleLinesMultiLineFile
{
    my ($InputFile,$StartTag,$EndTag)=@_;
    my ($line,@wanted_substrings);

    #Openning file for reading
    open(IFH,"$InputFile") || die "Can't open file: $InputFile\n";
      while($line=<IFH>)
      {
        if($line =~ /\Q$StartTag\E(.*?)\Q$EndTag\E/)
        {
           push(@wanted_substrings,$1);
        }
      }
return @wanted_substrings;
}



######################################################################
+#######
#Input file Looks Like:

#MultipleLinesMultiLineFile
#SomeChar
#    START
#value
#    END
#AnotherChar
#end MultipleLinesMultiLineFile


#
#Usage:
#$InputFile="$LocationOfTheScriptsDirectory\\MultyLine.txt";
#$StartTag='START';
#$EndTag='END';
#@StartEnd=getInfoFromMultipleLineMultiLineFile($InputFile,$StartTag,$
+EndTag);

sub getInfoFromMultipleLinesMultiLineFile
{
    my ($InputFile,$StartTag,$EndTag)=@_;
    my ($line,@wanted_substrings);

    #Openning file for reading
    open(IFH,"$InputFile") || die "Can't open file: $InputFile\n";
      while($line=<IFH>)
      {
        if (($line =~ m/\Q$StartTag\E/) .. ($line =~ m/\Q$EndTag\E/))
        {
           push(@wanted_substrings,$line);
        }
      }
return @wanted_substrings;
}

######################################################################
+#######
#Input file for longline:
#SingleLineSingleLineFile<A>AAA</A><B>BBB</B><C>CCC</C><A>123</A><D>DD
+D</D><A>HHH</A><C>CCC</C>end SingleLineSingleLineFile
#Usage:
#$InputFile="$LocationOfTheScriptsDirectory\\LongLine.txt";
#$StartTag='<A>';
#$EndTag='<\A>';
#@AValues=getInfoFromSingleLineSingleLineFile($InputFile,$StartTag,$En
+dTag);
#Result:@AValues=qw(AAA 123 HHH);

sub getInfoFromSingleLineSingleLineFile
{
    #Openning file for reading
    my ($InputFile,$StartTag,$EndTag)=@_;
    my ($line,@wanted_substrings);

    open(IFH,"$InputFile") || die "Can't open file: $InputFile\n";
    $line = <IFH>;
    #1
    #my @wanted_substrings = $line =~ /<A>(.*?)<\/A>/g;
    #2
    #push(@wanted_substrings,$1) while $line =~ /<A>(.*?)<\/A>/g;
    #3
    while ($line =~ /\Q$StartTag\E(.*?)\Q$EndTag\E/g)
    {
     push(@wanted_substrings,$1);
    }

 return "@wanted_substrings";
}
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