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Re: need to parse firts part of SQL-query (regex question)

by martin (Friar)
on Jan 17, 2008 at 18:22 UTC ( #662932=note: print w/replies, xml ) Need Help??

in reply to need to parse firts part of SQL-query (regex question)

How about this: Think positive and use a regex for the fields you want rather than what might or might not separate them, like this:

my $part_sql = "f1,f2, SUM(f3),CONCAT(f4,f5, f6), f7"; my @fields = $part_sql =~ m{ (?: ^ | , ) # start of string or comma ( # begin capture (?: # either: [^,()] # non-paren non-comma | # or: \( # left paren [^()]* # any amount of non-paren \) # right paren )* # as often as possible ) # end capture }gx; # take all matches print map { "$_\n" } @fields;

Of course, this simplistic approach does not handle nested parentheses.

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Re^2: need to parse firts part of SQL-query (regex question)
by bfdi533 (Friar) on Mar 27, 2008 at 21:32 UTC

    Quite an interesting solution. Of course, as you have stated, it does not handle nested parentheses. Which, of course, is something that I need to do.

    Any takers on how this can be adapted to handle nested parens?

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