Avro Schema Data Validations with Regular Expressions in Java - java

I'm very new to Using AVRO Schema and I have a use case where I need to validate AVRO schema data with regular expressions. I mean the field value can allow Numbers OR only allow Alphabets OR AlphaNumeric values OR fixed min-max length etc. I tried like below but it's not working. if any idea please assist me for the same .
AVRO schema is :
{
"type": "record",
"name": "Employee",
"namespace": "com.test.avro",
"fields": [
{
"name": "empId",
"type": "string",
"pattern": "[1-9]"
},
{
"name": "empName",
"type": "string",
"pattern": "[a-zA-Z]"
},
{
"name": "createdDate",
"type": "string",
"pattern": "^[1-9]$"
},
{
"name": "mobile",
"type": "string",
"pattern": "^[1-9]*$"
}
]
}
Thanks in Advance.

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