MongoDB - 如何仅选择数字字符串/在 mongo-shell 中检查字符串是否为数字 [英] MongoDB - How to select only numeric strings / Check whether string is numeric in mongo-shell

问题描述

我有一个集合，其中的字段是字符串，但这些字符串可以在其中包含一个数值，例如:

I have a collection where the fields are string but those strings can have a numeric value inside e.g.:

我的对象:{
示例:[
       {example: "words", ...},
       {example: "more words", ...},
       {example: "111", ...},
       {example: "4502", ...}
       ...
       ]
...
}

myObject: {
examples: [
         {example: "words", ...},
         {example: "more words", ...},
         {example: "111", ...},
         {example: "4502", ...}
         ...
         ]
...
}

如何以字符串格式查询111"和4502"以及任何其他数值?

How can I query "111" and "4502" and any other numeric values in string format?

推荐答案

您可以在查询对象中使用正则表达式来做到这一点:

You can use a regular expression in your query object to do that:

// Select docs where at least one examples element contains an example value
// that's made up only of digits.
db.test.find({'examples.example': /^\d+$/})

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