backgroundthe literal text background (case sensitive) \s*any whitespace character, repeated any number of times
:the literal : (5810 / 728 / 3A16)
\s*any whitespace character, repeated any number of times
urlthe literal text url (case sensitive) \s*any whitespace character, repeated any number of times
\(the literal ( (4010 / 508 / 2816)
\s*any whitespace character, repeated any number of times
Group AttributeValue(?<AttributeValue>(?:[^)])*) Non-Capturing Group(?:[^)])* *repeats the group contents below any number of times:
Negated Character Class[^)] )the literal ) (4110 / 518 / 2916)
g modifier: global. Finds all matches instead of stopping after the first