/
(?(DEFINE)
(?<decimal>(?(int)([.][0-9]+)?|[.][0-9]+))
(?<percentage>
(100|
(?<int>([0-9]|[1-9][0-9]))? # Have integer be optional (0-100 only)
(?P>decimal) # Have decimal required when an integer is not included
)
(?<symbol>%)
)
(?<hue>
(?<int>36[0]|3[0-5][0-9]|[12][0-9][0-9]|[1-9]?[0-9])? # Have integer be optional
(?P>decimal) # Have decimal required when an integer is not included
(?<symbol>\s*deg\s*)?
)
(?<alpha>
(?(alpha),\s*(
1[.]0|
(?<int>0)? # Have integer be optional
(?P>decimal) # Have decimal required when integer is not incldue
)\s*)
)
(?<hsl>\s*(?P>hue)\s*,\s*(?P>percentage)\s*,\s*(?P>percentage)\s*)
)
hsl(?<alpha>a)?\((?P>hsl)(?P>alpha)\)
/
gxJi