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实际上都是围绕正则来写的，看大家喜欢那种写法

package main

import (
    "fmt"
    "labix.org/v2/mgo"
    "labix.org/v2/mgo/bson"
    "time"
)

type User struct {
    Name     string    //用户名称
    Key      string    //关键字
    Modified time.Time //修改时间
}

func main() {
    str1 := "aaaaaaaaaaaaaaaaaaaaaaraaaaaaaaaaaaaa"
    str2 := "bbbbbbbbbbbbbbbbbbbbbbbbbhbbbbbbbbbbb"
    str3 := "xxxxxxxxxxxxxxxxxxxxx"

    session, err := mgo.Dial("localhost:27017")
    if err != nil {
        panic(err)
    }
    defer session.Close()

    c := session.DB("lsoa").C("users")
    c.DropCollection()
    for i := 0; i < 10; i++ {
        if i%2 == 0 {
            err = c.Insert(&User{fmt.Sprintf("cst%d", i), str1, time.Now()})
        } else {
            err = c.Insert(&User{fmt.Sprintf("est%d", i), str2, time.Now()})
        }
    }
    err = c.Insert(&User{fmt.Sprintf("cest%d", 12), str3, time.Now()})
    ac, err := c.Find(bson.M{}).Count()
    //第一种写法
    // query :=bson.M{"$or":[]bson.M{bson.M{"name": bson.M{"$regex": bson.RegEx{"ce", "i"}}},
    // bson.M{"key": bson.M{"$regex": bson.RegEx{"x", "i"}}}}}
 　　//第二种写法
    regex1 := bson.RegEx{"ce", "i"}
    regex2 := bson.RegEx{"x", "i"}
    
    query := bson.M{"$or": []bson.M{bson.M{"name": regex1}, bson.M{"key": regex2}}} 
    fmt.Println(query) 
    count, err := c.Find(query).Count() 
    fmt.Printf("All Count: %d ,Filter count:%d", ac, count) 
}