new TimePeriodEntityRecognizer(entityName) → {Bravey.RegexEntityRecognizer}
    An entity recognizer that can recognizes time period expressions. Returned entities value {"start":"HH:MM:SS","end":"HH:MM:SS"}.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| entityName | string | The name of produced entities. | 
- Source:
- To Do:
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        - from x to y, etc...