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Source Regular Expression 1?(?:[.\s-]?[2-9]\d{2}[.\s-]?|\s?\([2-9]\d{2}\)\s?)(?:[1-9]\d{2}[.\s-]?\d{4}\s?(?:\s?([xX]|[eE][xX]|[eE][xX]\.|[eE][xX][tT]|[eE][xX][tT]\.)\s?\d{3,4})?|[a-zA-Z]{7})
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