formatInitials.ts

public formatInitials(value: string): string {
    if (!value || value === '') {
      return value;
    }

    let format = value.split('').map((val) => val.toUpperCase());
    let formatted = [];

    if (value.toLowerCase().includes('th')) {
      const regex = /(\bth\b)/gm;
      format = value.trim().split(regex);
      formatted = format
        .filter((val) => /\w+/gm.test(val))
        .map((val) => {
          return val.trim().split(/\W+/gm);
        })
        .flat();
    } else {
      formatted = format.map((val) => val.trim());
    }

    const voorletters =
      formatted
        .filter((val) => /\w+/gm.test(val))
        .map((val) => val.trim().replace('.', '').replace(',', ''))
        .map((val) => {
          if (!val.toLowerCase().includes('th')) {
            return val.toUpperCase();
          }
          return val;
        })
        .join('.') + '.';

    return voorletters;
  }