Ruby正则表达式 - 提取单词

Question

我想从SQL查询中提取表名。

SELECT col1, col2, count(1) as count_all,     FROM     tbl1, tbl2 where condition order by column

我想要结果["tbl1", "tbl2"]

没有必要查询多个表。 在那种情况下，查询将是

SELECT col1, col2, count(1) as count_all,     FROM     tbl1  where condition order by column

预期结果["tbl1"]

提前致谢！

Answer 1

请注意，这可能会匹配SQL字符串中的内容，因此并不完美。

test = [
"SELECT col1, col2, count(1) as count_all FROM tbl1, tbl2 where condition order by column",
"SELECT col1, col2, count(1) as count_all FROM tbl1 where condition order by column",
"SELECT col1, col2, count(1) as count_all FROM tbl1",
]
tests.map { |str| str.match(/\s*from\s*([a-z_0-9]+(?:,\s*[a-z_0-9]+)*)\b/i); $1 }
#=> ["tbl1, tbl2", "tbl1", "tbl1"]