Finance Validators

const luhnCheck = (num: string): boolean => {
  let arr = (num + '').split('').reverse().map(x => parseInt(x));
  let lastDigit = arr.splice(0, 1)[0];
  let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val * 2) % 9) || 9), 0);
  return (sum + lastDigit) % 10 === 0;
};

const formatCurrency = (amount: number, locale = 'en-US', currency = 'USD'): string => 
  new Intl.NumberFormat(locale, { style: 'currency', currency }).format(amount);

const calculateTax = (amount: number, rate: number): number => amount * (rate / 100);

const isValid = (s: string): boolean => /^(bc1|[13])[a-zA-HJ-NP-Z0-9]{25,39}$/.test(s);

const isValid = (s: string): boolean => /^0x[a-fA-F0-9]{40}$/.test(s);

const isValid = (s: string): boolean => /^[0-9]{13,19}$/.test(s);

const isValid = (s: string): boolean => /^[A-Z]{2}\d{2}[A-Z0-9]{4}\d{7}([A-Z0-9]?){0,16}$/.test(s);

const isValid = (s: string): boolean => /^[A-Z]{6}[A-Z0-9]{2}([A-Z0-9]{3})?$/.test(s);

const isValid = (s: string): boolean => /^[A-Z]{2}[A-Z0-9]{9}[0-9]$/.test(s);

const isValid = (s: string): boolean => /^[0-9A-Z]{9}$/.test(s);

const isValid = (s: string): boolean => /^((0[0-9])|(1[0-2])|(2[1-9])|(3[0-2])|(6[1-9])|(7[0-2])|80)([0-9]{7})$/.test(s);

const isValid = (s: string): boolean => /^[A-Z]{2}[A-Z0-9+*]{2,12}$/.test(s);

const isValid = (s: string): boolean => /^[A-Z]{4}0[A-Z0-9]{6}$/.test(s);

const isValid = (s: string): boolean => /^[A-Z]{3}$/.test(s);

const isValid = (s: string): boolean => /^[1-9A-HJ-NP-Za-km-z]{32,44}$/.test(s);

const isValid = (s: string): boolean => /^addr1[a-z0-9]+$/.test(s);

const isValid = (s: string): boolean => /^r[1-9A-HJ-NP-Za-km-z]{24,34}$/.test(s);

const isValid = (s: string): boolean => /^[LM3][a-km-zA-HJ-NP-Z1-9]{26,33}$/.test(s);

const isValid = (s: string): boolean => /^D[5-9A-HJ-NP-U][1-9A-HJ-NP-Za-km-z]{32}$/.test(s);

const isValid = (s: string): boolean => /^1[a-zA-Z0-9]{47}$/.test(s);

const isValid = (s: string): boolean => /^cosmos1[a-z0-9]{38}$/.test(s);

const isValid = (s: string): boolean => /^T[a-zA-Z0-9]{33}$/.test(s);

const isValid = (s: string): boolean => /^\d{9}$/.test(s);

const isValid = (s: string): boolean => /^\d{2}-\d{2}-\d{2}$/.test(s);

const isValid = (s: string): boolean => /^\d{3}-\d{3}$/.test(s);

const isValid = (s: string): boolean => /^\d{18}$/.test(s);

const isValid = (s: string): boolean => /^\d{12}$/.test(s);

const isValid = (s: string): boolean => /^\d{8,17}$/.test(s);