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想实现一个mongodb 不区分大小写的查询，比如，查询字段为key，key的值为 Rundown,现在想实现的查询的方式key能匹配Rundown ,rundown,但不会匹配Rundown1。请问这个该如何实现了。ps:我用的是mongdb的java 驱动开发，
Use regular expressions, such as:
db.xxx.find( { key: /^rundown$/i } );
{"key" : { "$regex" : "^rundonw1$",$options:"i"}}
The purpose of writing this is to be used in Criteria.regex("^rundonw1$","i").
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Use regular expressions, such as:
{"key" : { "$regex" : "^rundonw1$",$options:"i"}}
The purpose of writing this is to be used in Criteria.regex("^rundonw1$","i").