It would be much simpler to work the other way round, i.e. by replacing all query terms 'x' by 'fieldname = x'. This would mean something like: 

  s/(\w+)/$1 ne 'OR' && $1 ne 'AND' && $1 ne 'NOT' ? "fieldname = '$1'
+" : $1/eg;

[download]

Hope this helps, -gjb-

In reply to Re: Parsing a boolean search string for SQL query by gjb
in thread Parsing a boolean search string for SQL query by bradcathey

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