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  1. or download this
    <cond> ::= <x> [ "OR" <cond> ]
<x>    ::= <y> [ "AND" <y> ]
<y>    ::= "(" <cond> ")" | <z> <op> <z>
<z>    ::= [tabname"."]colname | <value>
<op>   ::= "<" | ">" | "=" | "<>" | "<=" | ">="
  2. or download this
    condition : x | x /OR/i condition
x : y | y /AND/i y
...
COLNAME : /([a-z]{1}[\w]{0,18}[^_\ ])/i
VALUE : /(\w+)/ix
OP : /(<>|<=|>=|=|<|>)/