#!/usr/local/bin/perl

$re = qr@
             \{(
             (?:
                (?> [^{}]+ )    # Non-{} without backtracking
              |
                (??{ $re })     # Group with matching {}
             )*
             )\}
          @x;

my $string = 'value:patternList = "{error 1 1 {^E 0-20-9:0-50-9:0-50-9
+.*$} {^E 0-20-9:0-50-9:0-50-9.*$}} {three 1 1 {^.*35=A.*$|^.*35=5.*$}
+ {^.*35=A.*$|^.*35=5.*$}} {fixv 1 1 ^.*VFIXFxProxy.*Disconnected ^.*V
+FIXFxProxy.*Disconnected}"';

my $count = 1;
while($string =~ m/$re/g){
        my $inst = $1;
        my(@elements) = ($inst =~ m/((?<={)[^}]+(?=})|[^\s{}]+)/g);
        print "Instance $count\'s elements = ".join("\n", @elements)."
+\n\n\n";
        $count++;
}

exit;


__END__
Instance 1's elements = error
1
1
^E 0-20-9:0-50-9:0-50-9.*$
^E 0-20-9:0-50-9:0-50-9.*$


Instance 2's elements = three
1
1
^.*35=A.*$|^.*35=5.*$
^.*35=A.*$|^.*35=5.*$


Instance 3's elements = fixv
1
1
^.*VFIXFxProxy.*Disconnected
^.*VFIXFxProxy.*Disconnected
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Update Removed unnessicary grouping paranethesis.