^\s*--.*?\s*.*(?:IS (?:NOT )?NULL).*$ 这句正则的意思是什么
时间: 2023-11-18 13:03:17 浏览: 37
这个正则表达式的意思是匹配以"--"开头的注释并且包含"IS NULL"或"IS NOT NULL"的语句。其中,^\s*表示匹配字符串开头的任意空白字符,--表示匹配注释,.*?表示匹配任意字符,但是尽可能少地匹配,\s*表示匹配任意数量的空白字符,.*表示匹配任意字符,(?:IS (?:NOT )?NULL)表示匹配"IS NULL"或"IS NOT NULL",$表示匹配字符串结尾。该正则表达式通常用于匹配SQL语句中的条件。
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