#一个非常简单的SQL查询语句匹配
(?isx-m)
^
\bSelect\s+(?<选择列>(?>[^()]+?|\((?<Open>)|\)(?<-Open>))*?(?(Open)(?!)))
\s+From\s+(?<数据表>(?>[^()]+?|\((?<Open>)|\)(?<-Open>))*?(?(Open)(?!)))
(?:\s+Where\s+(?<条件>(?>[^()]+?|\((?<Open>)|\)(?<-Open>))*?(?(Open)(?!))))?
(?:\s+Group\s+By\s+(?<分组>(?>[^()]+?|\((?<Open>)|\)(?<-Open>))*?(?(Open)(?!))))?
(?:\s+Having\s+(?<分组条件>(?>[^()]+?|\((?<Open>)|\)(?<-Open>))*?(?(Open)(?!))))?
(?:\s+Order\s+By\s+(?<排序>(?>[^()]+?|\((?<Open>)|\)(?<-Open>))*?(?(Open)(?!))))?
$