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Update writing-policies-validate.md

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Denys Bielyshev 2019-06-21 17:37:38 +03:00 • committed by GitHub
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@ -7,7 +7,7 @@ A validation rule is expressed as an overlay pattern that expresses the desired
1. Validation will fail if a field is defined in the pattern and if the field does not exist in the configuration.
2. Undefined fields are treated as wildcards.
3. A validation pattern field with the wildcard value '*' will match zero or more alphanumeric characters. Empty values or missing fields are matched.
3. A validation pattern field with the wildcard value '*' will match zero or more alphanumeric characters. Empty values are matched. Missing fields are not matched.
4. A validation pattern field with the wildcard value '?' will match any single alphanumeric character. Empty or missing fields are not matched.
5. A validation pattern field with the wildcard value '?*' will match any alphanumeric characters and requires the field to be present with non-empty values.
6. A validation pattern field with the value `null` or "" (empty string) requires that the field not be defined or has no value.