Why jsonschema is not match with the json? - json

Question

Given that, I have the below json:
{
"msg":"aaaa",
"email":"aaa#gmail.com"
}
Then, I wrote the below json schema:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"title": "Json schema sample",
"type": "object",
"additionalProperties": true,
"required": [
"msg",
"email"
],
"properties": {
"msg": {
"type": "string"
},
"email": {
"type": "string",
"pattern": "^[a-z0-9._%+-]+#[a-z0-9.-]+\.[a-z]{2,}$"
}
}
}
And sadly it is not matches with the json.
If you remove the ,"pattern": "^[a-z0-9._%+-]+#[a-z0-9.-]+\.[a-z]{2,}$" which is the regular expression for checking the email, then it works well. Please test it in this website.
I am sure that my regular expression for email is fine. But I don't know why it is not working in the json schema!

Answer 1

The \ is also an escape character in the json string, so now it's invalid json.
You could also see that when validating the json, for example on jsonlint.com
So your pattern needs a second \:
pattern": "^[a-z0-9._%+-]+#[a-z0-9.-]+\\.[a-z]{2,}$"
Full example: (don't forget to select draft-04 on https://jsonschemalint.com/, or change the schema to draft-07)
{
"$schema": "http://json-schema.org/draft-04/schema#",
"title": "Json schema sample",
"type": "object",
"additionalProperties": true,
"required": [
"msg",
"email"
],
"properties": {
"msg": {
"type": "string"
},
"email": {
"type": "string",
"pattern": "^[a-z0-9._%+-]+#[a-z0-9.-]+\\.[a-z]{2,}$"
}
}
}