Apply several string transformations in scala

Question

I want to perform several ordered and successive replaceAll(...,...) on a string in a functional way in scala.

What\'s the most elegant solution ? Scalaz welcome ! ;

Answer 1

#to replace or remove multiple substrings in scala in dataframe's string column

import play.api.libs.json._
#to find
def isContainingContent(str:String,regexStr:String):Boolean={
  val regex=new scala.util.matching.Regex(regexStr)
  val containingRemovables= regex.findFirstIn(str)
  containingRemovables match{
    case Some(s) => true
    case None => false
  }
}
val colContentPresent= udf((str: String,regex:String) => {
  isContainingContent(str,regex)
})
#to remove
val cleanPayloadOfRemovableContent= udf((str: String,regexStr:String) => {
  val regex=new scala.util.matching.Regex(regexStr)
  val cleanedStr= regex.replaceAllIn(str,"")
  cleanedStr
})
#to define
val removableContentRegex=
"[\\s\\S]*?|\\\\n|<\\?xml[\\s\\S]*?\\?>"

#to call
val dfPayloadLogPresent = dfXMLCheck.withColumn("logsPresentInit", colContentPresent($"payload",lit(removableContentRegex)))
val dfCleanedXML = dfPayloadLogPresent.withColumn("payload", cleanPayloadOfRemovableContent($"payload",lit(removableContentRegex)))