How to use 'regex numbers only' in JavaScript

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61function getRegex (isDecimal: boolean): RegExp {
62 return new RegExp(
63 isDecimal
64 ? `^(0|[1-9]\\d*)(\\${KEYS.DECIMAL}\\d*)?$`
65 : '^(0|[1-9]\\d*)$'
66 );

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