How to use 'regex number only' in JavaScript
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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 }