public String parseExprContent(String rawContent) {
		StringBuilder sb = new StringBuilder();
		
		String s = "";
		for (int i = 0; i < rawContent.length(); i++) {
			char c = rawContent.charAt(i);
			if(Character.isLetter(c)){ // When we find a letter, do a while till you cant find more digits
				s += c;
				i++;
				c = rawContent.charAt(i);
				while(Character.isDigit(c)){
					s += c;
					i++;
					if(!(i < rawContent.length())){ // Avoids index out of bounds
						break;
					}
					c = rawContent.charAt(i);
					
				}
				i--; // So the next forloop doesnt skip an index
				s = s.toUpperCase();
				if(validCellRef(s)){
					String cellContent = getCellContent(s); // Tries to get expr from hashMap
					if (!cellContent.equals("")) {
						sb.append(cellContent);
						s = "";
					}else{
						System.out.println("Sheet -> parseExpr() cant find cellRef in hashMap");
					}
				}
				
			}else{
				sb.append(c);
			}

		}
		return sb.toString();
	}