New Post: How to properly write values with leading zeroes with its unknown length

I'm working with values like:

0406440452
017649106486
040 28803190

I can't create mutual format for them...Seems like matching these values by separate regexes and applying specific format is only way to do it. What would you say?

P.S.: placing apostrophe is okay but I didn't figured the way how to do it without showing it in Excel...


UPDATE1

I've implemented possible solution:

1. I divided my values on 2 types: only numbers and numbers with spaces. Made appropriate regexes for them.
2. For only numbers I do:
   

                $valueLength = strlen($value);

                $numberFormat = '0';

                for($i = 1; $i <= $valueLength;$i++) {
                    $numberFormat = $numberFormat . '#';
                }

                $cell->getStyle()->getNumberFormat()->setFormatCode($numberFormat);
                $cell->setValueExplicit($value, PHPExcel_Cell_DataType::TYPE_NUMERIC);
                $cell->getStyle()->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_LEFT);

As a result I recieve format like 0#########, depending from numbers amount
For values with spaces I can make similar logic as in 2(but add space in format).

What do you think about all of this, is it good idea at all?