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Does anyone have any example code for sanitizing usernames to be alphanumeric only? <https://www.ory.sh/docs/kratos/manage-identities/best-practices#sanitize-usernamestraits>  I understand it needs a regex, but there is no documentation on where this regex should go in the identity schema.  Thanks!

Thanks to <@U075KNYJXNC> it can be done like this:
```"username": {
  "type": "string",
  "minLength": 6,
  "maxLength": 32,
  "pattern": "^[a-zA-Z0-9]*$",
  "title": "Username",
  "<http://ory.sh/kratos|ory.sh/kratos>": {
    "credentials": {
      "password": {
        "identifier": true
      }
    }
  }
},```
using the `"pattern"` with the regex pattern desired