docs: function classify(str) {
    let replace1 = (match, separator, chr) => chr ? (`_${chr.toUpperCase()}`) : '';
    let replace2 = (match, initialChar, separator, chr) => initialChar + (chr ? chr.toUpperCase() : '');
    let parts = str.split('/');
    for (let i = 0; i < parts.length; i++) {
      parts[i] = parts[i]
        .replace(STRING_CLASSIFY_REGEXP_1, replace1)
        .replace(STRING_CLASSIFY_REGEXP_2, replace2);
    }
  
    return parts.join('/').replace(STRING_CLASSIFY_REGEXP_3, (match, separator, chr) => match.toUpperCase());
  }