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How to use 'regex number and letters' in JavaScript

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polkadot-js/apps
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  );
67}
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