CODEWITHSUNDEEP
jsonschema
Sebastian Olsen
Sebastian Olsen

Reputation: 10888

Ignoring spaces in length validation for JSON Schema

Say you have this simple schema

{
  "type": "string",
  "minLength": 2,
}

The value "ab" would be valid, but the value "a " or " " would also be valid. Is there a way to ignore spaces when validating the length, so only "ab" is valid in this example?

Upvotes: 3

Views: 5151

Answers (2)

Andrey Agibalov
Andrey Agibalov

Reputation: 7694

Something like this should work:

{
  "pattern": "^(\\s*\\w\\s*){2,}$"
}

"at least 2 groups where each group has exactly one non-space character (optionally surrounded by space characters)".

"" -> false
"  " -> false
"   " -> false
"  a" -> false
"a  " -> false
"  a  " -> false
"  a  b  " -> true
"ab" -> true

Upvotes: 4

cole
cole

Reputation: 1757

I do not know enough about JSON schema to definitively say whether there is a way to do what you are asking with the length attribute. However, if you have an idea of what possible non-whitespace characters are allowed, you can do something like the following that allows any number of white-space characters along with two required characters (in this case - alphabetic characters).

NOTE: I made the declaration inside an array for easy testing

{
  "type": "array"
  , "items": {
      "type":"string"
      , "pattern": "[A-Za-z]\\s*[A-Za-z]"
  }
}

Some tests:

[
  "ab"
  , "a " // fails
  , "  " // fails
  , "cz"
  , "a    b"
  , "  a b"
  , "  b" // fails
]

Upvotes: 1

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