fun indexOf(string: String): Int
fun indexOf(string: String, startIndex: Int): Int
Returns the index within this string builder of the first occurrence of the specified string, starting at the specified startIndex.
Returns -1 if the specified string does not occur in this string builder starting at the specified startIndex.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/-string-builder/index-of.html