That doesn't seem to do what the OP wants

Come now young man, where's your sense of adventure? With a bit of lookahead and a state machine you can easily massage the token stream into something useful:

use SQL::Tokenizer;

my $query = q{f1,f2, SUM(f3),CONCAT(f4,f5, f6), sum((f1+f2)*f3)};
my @token = SQL::Tokenizer->tokenize($query);

my $paren_depth = 0;
my $cache       = '';

while(my $val = shift @token) {
    if ($token[0] eq '(') {
        $paren_depth++;
    }
    if ($val eq ')') {
        $paren_depth--;
        if ($paren_depth == 0) {
            print $cache;
            $cache = '';
        }
    }
    if ($paren_depth) {
        $cache .= $val;
    }
    else {
        print "$val\n";
    }
}
__PRODUCES__
f1
,
f2
,
SUM(f3)
,
CONCAT(f4,f5, f6)
,
sum((f1+f2)*f3)

[download]

That's not too shabby. The tokenizer does the heavy lifting, you just have to put the pieces back together again.

• another intruder with the mooring in the heart of the Perl

In reply to Re^3: need to parse firts part of SQL-query (regex question) by grinder
in thread need to parse firts part of SQL-query (regex question) by jeanluca

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