Rename split method to splitBy and revive old split implementation interpreting parameter as regex to provide the migration path.

libraries/stdlib/src/kotlin/text/Strings.kt

@@ -760,7 +760,8 @@ public fun String.splitToSequence(vararg delimiters: String, ignoreCase: Boolean
  * the beginning to the end of this string, and matches at each position the first element in [delimiters]
  * that is equal to a delimiter in this instance at that position.
  */
-public fun String.split(vararg delimiters: String, ignoreCase: Boolean = false, limit: Int = 0): List<String> =
+deprecated("Temporary name 'splitBy' shall be replaced soon with 'split'.")
+public fun String.splitBy(vararg delimiters: String, ignoreCase: Boolean = false, limit: Int = 0): List<String> =
         splitToSequence(*delimiters, ignoreCase = ignoreCase, limit = limit).toList()
 
 /**

libraries/stdlib/src/kotlin/text/StringsJVM.kt

@@ -95,6 +95,12 @@ public fun String.format(locale: Locale, vararg args : Any?) : String = java.lan
  */
 public fun String.split(regex: Pattern, limit: Int = 0): List<String> = regex.split(this, limit).asList()
 
+/**
+ * Splits this string around matches of the given regular expression.
+ */
+deprecated("Convert an argument to regex with toRegex or use splitBy instead.")
+public fun String.split(regex: String): Array<String> = split(regex.toRegex()).copyToArray()
+
 
 /**
  * Returns a substring of this string starting with the specified index.