subset

external fun subset(sub: String, dom: String, options: RangeOptions = definedExternally): Boolean(source)
external fun subset(sub: String, dom: Range, options: RangeOptions = definedExternally): Boolean(source)
external fun subset(sub: Range, dom: String, options: RangeOptions = definedExternally): Boolean(source)
external fun subset(sub: Range, dom: Range, options: RangeOptions = definedExternally): Boolean(source)

Return true if the subRange range is entirely contained by the superRange range.