How to use 'regex number only' - JavaScript

How to use 'regex number only' in JavaScript

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ractivejs/ractive

55 function getNumber(parser) {
56   const number = parser.matchPattern(numberPattern);
57   if (number) return { v: +number };
58 },

Sage/carbon

35 function isValidNumber(value) {
36   const regex = new RegExp('^[-]?[0-9]*$');
37   const result = regex.test(value);
38 
39   return result;
40 }

55	function getNumber(parser) {
56	const number = parser.matchPattern(numberPattern);
57	if (number) return { v: +number };
58	},

35	function isValidNumber(value) {
36	const regex = new RegExp('^[-]?[0-9]*$');
37	const result = regex.test(value);
38
39	return result;
40	}

How to use 'regex number only' in JavaScript

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