before:
```
$ arc lint
Exception
Error in parsing '.arclint' file, for linter 'Anonymizable fields'.
Parameter has invalid type. Expected a regular expression, but value is not valid: preg_match(): Delimiter must not be alphanumeric or backslash
(Run with `--trace` for a full exception trace.)
```
after:
```
$ arc lint
Exception
Error in parsing '.arclint' file, for linter 'Anonymizable fields'.
Parameter 'script-and-regex.regex' has invalid type. Expected a regular expression, but value is not valid: preg_match(): Delimiter must not be alphanumeric or backslash
(Run with `--trace` for a full exception trace.)
```