Looking for the shortest (1 line only) and cleanest way to extract a map from a collection of parameters

gistfile1.scala

val args=Array("x=5", "y=10", "debug=true", "-verbose", "toto=truc1=titi", "nop", "tata=")

val argsRE="([^=]+)=(.*)".r

// ------- solution 1 with regex
args.flatMap{case argsRE(k,v) => Some(k->v) case _=> None}.toMap

// ------- solution 2 - with regex
args.collect{case argsRE(k,v) => k->v}.toMap

// ------- solution 3 - with regex
(for(argsRE(k,v) <- args) yield k->v).toMap

//------- solution 4 - with regex
args.flatMap(argsRE findFirstMatchIn _).map(x => x.group(1)->x.group(2)).toMap

//------- solution 5 - with split
args.map(_.split("=",2)).collect{case Array(k,v) => k->v}.toMap

//------- solution 6 - with split
(for(Array(k,v) <- args.map(_.split("=",2))) yield k->v).toMap

//------ solution 7 - with span
args.map(_.span(_!='=')).map{case (k,"")=>k->"" case (k,v)=>k->v.tail}.toMap