Source: Schema.org v30.1 vocabulary. Official valuePattern property definition.
What does valuePattern mean?
Specifies a regular expression for testing literal values according to the HTML spec.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status