如何查询Array [String]以查找正则表达式匹配项？
要查询正则表达式匹配的数组字符串，请使用以下语法
db.yourCollectionName.find( { yourFieldName: /yourStartingValue./ } ).pretty();首先让我们创建一个包含文档的集合
> db.queryArrayDemo.insertOne({"StudentFullName":["Carol Taylor","Caroline
Williams","Claire Brown"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca2774c6304881c5ce84ba0")
}
> db.queryArrayDemo.insertOne({"StudentFullName":["John Smith","Jace Doe","Jabin
Brown"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca277b36304881c5ce84ba1")
}以下是在find()方法的帮助下显示集合中所有文档的查询
> db.queryArrayDemo.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5ca2774c6304881c5ce84ba0"),
"StudentFullName" : [
"Carol Taylor",
"Caroline Williams",
"Claire Brown"
]
}
{
"_id" : ObjectId("5ca277b36304881c5ce84ba1"),
"StudentFullName" : [
"John Smith",
"Jace Doe",
"Jabin Brown"
]
}这是您如何查询数组字符串以查找正则表达式的方法
> db.queryArrayDemo.find( { StudentFullName : /J./ } ).pretty();这将产生以下输出
{
"_id" : ObjectId("5ca277b36304881c5ce84ba1"),
"StudentFullName" : [
"John Smith",
"Jace Doe",
"Jabin Brown"
]
}