lit 24/7 in exclusion style string. josm error

[Allroads]

Josm gives a warning.
org.openstreetmap.josm.gui.mappaint.mapcss.parsergen.ParseException: Encountered "" at line 1592, column 34.

line 1592:

way|z18-["highway"]["lit"]["lit"!~/^(yes|no|24/7|sunset-sunrise|automatic)$/]::highway_lit_layer { 

this |24/7| gives the problem error josm in the exclusion string

way|z18-["highway"]["lit"="yes"]::highway_lit_layer { 
repeat-image: highway-lit-yes.svg;
}       
way|z18-["highway"]["lit"="no"]::highway_lit_layer { 
repeat-image: highway-lit-no.svg;
}
way|z18-["highway"]["lit"="24/7"]::highway_lit_layer { 
repeat-image: highway-lit-247.svg;
}
way|z18-["highway"]["lit"="sunset-sunrise"]::highway_lit_layer { 
repeat-image: highway-lit-sunset-sunrise.svg;
}
way|z18-["highway"]["lit"="automatic"]::highway_lit_layer { 
repeat-image: highway-lit-automatic.svg;
}
/* Last lit tag Else. PROBLEM with 24/7 */
way|z18-["highway"]["lit"]["lit"!~/^(yes|no|24/7|sunset-sunrise|automatic)$/]::highway_lit_layer { 
repeat-image: highway-lit-else.svg;
}

The highway-lit-247.svg is visible. When I leave out last lit tag lines, to show else icon.

This works with the 24/7 and the " "

way|z18-["highway"]["lit"="24/7"]::highway_lit_layer { 
repeat-image: highway-lit-247.svg;

[Klumbumbus]

In ["lit"!~/^(yes|no|24/7|sunset-sunrise|automatic)$/] you use a regular expression. As the / character has a special function in regular expressions by default you need to define that in this case it should not use its special function but just take it as "normal" character which you can do by adding a \ before that character.
So you need to use ["lit"!~/^(yes|no|24\/7|sunset-sunrise|automatic)$/]

[Allroads]

Thanks, it works.