I don't understand why the following code, using Regexp::Common balanced regular expression does not work:

#use strict;
use Regexp::Common qw /balanced/;

my $file = <<END;
* Converting valif() 
v1 0 1 pwl 0 -5 10n 5
e2 2 0 value=valif(v(1)>0, 2, -2)
.tran 10n 10n
.plot tran v(1) v(2)
END

#my %RE;
my @file = split('\n',$file);
my $re_valif=${RE}{balanced}{-keep}{-parens=>'()'};
print $re_valif . "\n";
foreach (@file) {
    print $_ . "\n";
    /${RE}{balanced}{-parens=>'()'}/ and print "->Matched |$1|$2|$3|$4
+|\n";
}

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In reply to Regex::Common balanced does not seem to work by ala_poubelle

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