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in reply to Re: Regular Expression problem when Extracting Start\ VALUE \End
in thread Regular Expression problem when Extracting Start\ VALUE \End

Text::Balances does not export functions into the main namespace by default. This means you have two options. First, you could ask for the function by name: 
use Text::Balanced qw( extract_tagged );
# The rest of your code from above here.

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This will bring extract_tagged into your module's namespace.

Alternatively, you could fully qualify the name: 

use Text::Balanced;

my $text = 'sometexthere';

($extracted, $remainder) = Text::Balanced::extract_tagged($text);

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Phil

Replies are listed 'Best First'.
Re^3: Regular Expression problem when Extracting Start\ VALUE \End
by gasho (Beadle) on Sep 30, 2005 at 20:36 UTC
    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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[reply]
[d/l]
      I think that if it works for you and you understand it, that is good. Further, if writing it taught you something, that is better. But, I also think that tools like Text::Balanced make it possible for me to think at a higher level without getting bogged down in regex details on standard tasks.

      Phil

[reply]
Re^3: Regular Expression problem when Extracting Start\ VALUE \End
by Anonymous Monk on Feb 12, 2015 at 23:20 UTC

    I have Balanced.pm in the path but when I run the simple code 

     
#!/usr/bin/perl
use strict;
use warnings;
use Text::Balanced qw(extract_bracketed);

        my $text =  "{{define:STOP,law:101A}{here:stop}}";
        my @line = Text::Balanced::extract_braketed($text,'{}');

    [download]
    the error "Text::Balanced doesn't contain an __DATA__ token at .... line 7" is returned. when I change the line 
     
 my @line = Text::Balanced::extract_braketed($text,'{}');

    [download]
    to 
     my @line = extract_braketed($text,'{}');

    [download]
    I get Undefined subroutine &main::extract_braketed called at ... line 7. Any suggestions are welcome?

[reply]
[d/l]
[select]
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