[FEA] split with regular expression support

[viadea]

I wish we support split with regular expressions.

Mini repro:

val address = Seq((1,"abc.com"),
(2,"...abc"),
(3,".a.b.c"))

import spark.implicits._
val df = address.toDF("id","txt")
df.write.mode("overwrite").format("parquet").save("/tmp/testparquet")
val df2=spark.read.parquet("/tmp/testparquet")
df2.createOrReplaceTempView("df2")
spark.sql("select id,txt, split(txt, '\\\\.')[0] AS new_txt from df2").show()

Not-supported-messages:

!Expression <StringSplit> split(txt#209, \., -1) cannot run on GPU because regular expressions are not supported yet

[sameerz]

Same as issue #4003

[sameerz]

Closing as duplicate