Currency Input Mask

HTML

<script src="https://rawgit.com/RobinHerbots/jquery.inputmask/3.x/dist/jquery.inputmask.bundle.js"></script>
So the following values are allowed:

5 6 (feet and inches separated by spaces)<br />
5'6" (feet and inches in the correct format)<br />
5.2 6 (decimal feet separated by spaces)<br />
5.2'6" (decimal feet in the correct format)<br />
5 6.1 (decimal inches separated by spaces)<br />
5'6.1" (decimal inches in the correct format)<br />
5.2 6.1 (decimal feet and inches separated by spaces)<br />
5.2'6.1" (decimal feet and inches in the correct format)<br />
5 6 1/2 (any combination above followed by a space and fraction)<br />
5.2'6.1 1/2" (again with decimals)<br />
78" (only inches)<br />
78.4" (only inches with a decimal)<br />
    
<input id="feet" />

JavaScript

// allow numbers
    var p_num = "[0-9]";

    // numbers are up to 9 characters (it needs a range, for some reason)
    var p_range = "{0,9}";

    // allow a single decimal
    var p_dec = "([.]{0,1})";

    // allow a single space (needs to happen only if not directly followed by a decimal)
    var p_space = "([ ]{0,1})";

    // numbers, possible single decimal and/or space
    var p_base = p_num + p_range + p_dec + p_space;

    // only allow a single/double quote after a number
    var p_afternum = "?(?=" + p_num + ")";

    // allow a single or double quote
    var p_quote = "(\'(0?" + p_base + ")?\|\"$)";

    // issues: 
    // i do not need a range/cap on numbers
    // after using decimal or space - only one number is allowed to follow (do not cap the range on numbers, only decimal/space)
    // do not allow a space directly following a decimal
    // do not allow a decimal directly following a single or double quote
    
    var ex = "(" + p_base + ")" + p_afternum + p_quote + "(0?" + p_base + ")?\""

$('#feet').inputmask('Regex', { regex: ex });