MaxInterview - javascript regex test number only

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1/^[0-9]*$/.test('abc123') // false

1/^[\+\-]?\d*\.?\d+(?:[Ee][\+\-]?\d+)?$/
2
3/* 
4	matched values:
5    -2.14e10
6    +14E-20
7    42.69
8*/

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