CODEWITHSUNDEEP
stringkotlinsubstring
user18315523
user18315523

Reputation:

How can I check whether a given string contains another substring more than once?

How can I check whether a given string contains another substring more than once?

fun isFieldRepeated(jsonIn: String, field:String): Boolean { 
  var count: Int = 0; 
  while (jsonIn.indexOf(field) > -1) { 
       jsonIn = jsonIn.substring(jsonIn.indexOf(field)+field.length(),jsonIn.length()); 
       count++;  
  } 
  if(count>1) 
   return true; 
  return false; 
 }

Upvotes: 1

Views: 379

Answers (2)

lukas.j
lukas.j

Reputation: 7173

fun isFieldRepeated(jsonIn: String, field: String): Boolean {
  return jsonIn.windowed(field.length) { it == field }.count { it } > 1
}

Or as an extension function:

fun String.isFieldRepeated(field: String) = windowed(field.length) { it == field }.count { it } > 1

... to be used for example like this:

println("abcdefghcdij".isFieldRepeated("cd"))

Upvotes: 0

thinkgruen
thinkgruen

Reputation: 1

I would simplify it to

fun isFieldRepeated(jsonIn: String, field:String): Boolean =
  jsonIn.firstIndexOf(field) != jsonIn.lastIndexOf(field)

Upvotes: 1

Related Questions