How to match float value in mongoquery? - regex

Question

This is my sample documents collection of MongoDB. I need an expected result so anyone guide me to solve my problem
/* 1 */
{
"_id" : 1.0,
"user_id" : "5c592f6716209a24f4125001",
"tu_code" : "5"
}
/* 2 */
{
"_id" : 2.0,
"user_id" : "5c592f6716209a24f4125002",
"tu_code" : "50"
}
/* 3 */
{
"_id" : 3.0,
"user_id" : "5c592f6716209a24f4125003",
"tu_code" : "50.21"
}
/* 4 */
{
"_id" : 4.0,
"user_id" : "5c592f6716209a24f4125004",
"tu_code" : "50.22"
}
/* 5 */
{
"_id" : 5.0,
"user_id" : "5c592f6716209a24f4125005",
"tu_code" : "52"
}
/* 6 */
{
"_id" : 3.0,
"user_id" : "5c592f6716209a24f4125006",
"tu_code" : "5.1"
}
/* 7 */
{
"_id" : 6.0,
"user_id" : "5c592f6716209a24f4125007",
"tu_code" : "5.1.1"
}
/* 8 */
{
"_id" : 7.0,
"user_id" : "5c592f6716209a24f4125008",
"tu_code" : "5.2"
}
/* 9 */
{
"_id" : 8.0,
"user_id" : "5c592f6716209a24f4125009",
"tu_code" : "5.2.1"
}
Here I mentioned my mongo aggregate query below
[
{ "$project": {
"tu_code": { "$toLower": "$tu_code" },
}},
{ "$match": { "tu_code": {"$regex": "^5.*"}}}
]
This above query produces the below result
| _id| tu_code |
| ---| --------|
| 1 | 5 |
| 2 | 50 |
| 3 | 50.21 |
| 4 | 50.22 |
| 5 | 52 |
| 6 | 53 |
| 7 | 5.1 |
| 8 | 5.1.1 |
| 9 | 5.2 |
| 10 | 5.2.1 |
But I want expected result given below
| _id| tu_code |
| ---| --------|
| 1 | 5 |
| 7 | 5.1 |
| 8 | 5.1.1 |
| 9 | 5.2 |
| 10 | 5.2.1 |
Anyone help me to solve this I don't know how to get my expected result.

Answer 1

You can use the \b (word boundary) operator at the end of search expression,
[
{
"$match": {
"tu_code": {
"$regex": "^5\\b"
}
}
}
]
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