Question: If I apply the regular expression ([0-9]{3}) - ? ( ([0-9]{3}) - ? ([0-9]{4})) to the string 214-555-6789, the 5 resulting groups, in order, will

 If I apply the regular expression ([0-9]{3}) - ? ( ([0-9]{3})

If I apply the regular expression ([0-9]{3}) - ? ( ([0-9]{3}) - ? ([0-9]{4})) to the string 214-555-6789, the 5 resulting groups, in order, will be and

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