- var cssLengthRelativeUnit = /^(\d[.\d]*)+(em|ex|px|gd|rem|vw|vh|vm|ch|mm|cm|in|pt|pc|deg|rad|ms|s|hz|khz){1}?/i;\r
- var emptyMarginRegex = /^(?:\b0[^\s]*\s*){1,4}$/;\r
+ var cssLengthRelativeUnit = /^([.\d]*)+(em|ex|px|gd|rem|vw|vh|vm|ch|mm|cm|in|pt|pc|deg|rad|ms|s|hz|khz){1}?/i;\r
+ var emptyMarginRegex = /^(?:\b0[^\s]*\s*){1,4}$/; // e.g. 0px 0pt 0px\r
+ var romanLiternalPattern = '^m{0,4}(cm|cd|d?c{0,3})(xc|xl|l?x{0,3})(ix|iv|v?i{0,3})$',\r
+ lowerRomanLiteralRegex = new RegExp( romanLiternalPattern ),\r
+ upperRomanLiteralRegex = new RegExp( romanLiternalPattern.toUpperCase() );\r