I want to specify a pattern in a json schema that would require an asterisk at the beginning of a string that can only contain 2 characters such as:
*A
I have tried the following pattern but it does not work:
"code": {
"type": "string",
"pattern": "^[*A-Z]{2}$"
}
The above pattern allows: *A and AA which is not what I want.
I am using the ajv json schema validator.
The regex [*A-Z]{2} matches either *, or A-Z. Asterisks are a bit odd, so you need to make it its own group. Try this out: ^[*][A-Z]{2}$
Edit: I'm assuming you mean it needs an asterisk followed by 2 characters, like *BC or *AE. If you mean it must start with an asterisk followed by exactly one character, just remove the {2}.
* in brackets. A back-escape is sufficient to escape any special character (and then another backslash for the JSON encoding).
Your pattern ^[*A-Z]{2}$ allows 2 times either an asterix, or a character in the range A-Z
If you want to allow 2 characters, and the first has to be an asterix:
^\*[A-Z]$
