A simplicistic approach would be to repeatedly apply these three rules to simplify things:

#!perl -w
use strict;
my @terms = (
    '( ( T || F ) && T )',
    '( ( T || F ) && ( F && F ))'
);

sub simplify {
    my( $term ) = @_;
    $term =~ s!\s+!!g; # eliminate all whitespace
    my $changed;
    do {
        $changed = 0;
        $changed ||= ($term =~ s!F\|\|!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!\|\|F!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!T\&\&!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!\&\&T!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!F\&\&!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!\&\&F!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!T\|\|!!g);
        #print "$term ($changed)\n";
        $changed ||= ($term =~ s!\|\|T!!g);
        #print "$term ($changed)\n";

        $changed ||= ($term =~ s!\(([FT])\)!$1!g);
        #print "$term ($changed)\n";
    } while $changed;
    return $term
}

for my $t (@terms) {
    print "$t => " . simplify( $t ), "\n";
};

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In reply to Re^3: Evaluate arbitrary boolean expressions by Corion
in thread Evaluate arbitrary boolean expressions by gauss76

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