How to enforce naming pattern such as "*-*-asp" using Azure policy? - naming-conventions

Question

I am trying to enforce Azure resource naming pattern for prod/dev/uat environments, the suggested pattern is [service name]-[environment]-[resource short name]. Is there a way to enforce this using Azure policy? It appears that Azure policy (Like/Match functions) does not support regex. Please suggest a workaround solution.
Note: The [service name], [environment], [resource short name] are of variable length.
Thanks.

Answer 1

Below code block should address the requirement of *-*-asp pattern. i have not put this through sufficient testing, but for anyone who is looking for enforcing naming conventions through policies i hope this would be of help. Also, it would be interesting to know if there is better solution than that provided here.
Azure Policy Like/Match does not support regex, the complexity of the below solution only highlights the need for such a system. There is a user voice, i request for your vote, if you see relevance of regex feature in Azure policy - link here.
{
"if": {
"allOf": [
{
"field": "type",
"in": "[parameters('listOfResourceTypes')]"
},
{
"not": {
"allOf": [
{
"value": "[equals(length(split(parameters('namePattern'), '-')), length(split(field('name'), '-')))]",
"equals": true
},
{
"value": "[equals(toLower(last(split(parameters('namePattern'), '-'))), toLower(last(split(field('name'), '-'))))]",
"equals": true
}
]
}
}
]
},
"then": {
"effect": "[parameters('policyEffect')]"
}
}