Modify split(String) usages within stdlib.

Author: ilya-g

libraries/stdlib/src/kotlin/dom/DomJVM.kt

@@ -121,7 +121,7 @@ public fun Node.previousElements(): List<Element> = previousSiblings().filterIsI
 public var Element.classSet: MutableSet<String>
     get() {
         val answer = LinkedHashSet<String>()
-        val array = this.classes.split("""\s""")
+        val array = this.classes.split("""\s""".toRegex())
         for (s in array) {
             if (s.length() > 0) {
                 answer.add(s)

libraries/stdlib/src/kotlin/io/files/FilePathComponents.kt

@@ -95,7 +95,7 @@ public fun File.filePathComponents(): FilePathComponents {
     // Split not only by / or \, but also by //, ///, \\, \\\, etc.
     val list = if (rootName.length() > 0 && subPath.isEmpty()) listOf() else
         // Looks awful but we split just by /+ or \+ depending on OS
-        subPath.split("""\Q${File.separatorChar}\E+""").toList().map { it -> File(it) }
+        subPath.split("""\Q${File.separatorChar}\E+""".toRegex()).toList().map { it -> File(it) }
     return FilePathComponents(rootName, list)
 }