fun StringBuilder.deleteRange( startIndex: Int, endIndex: Int ): StringBuilder
Removes characters in the specified range from this string builder and returns this instance.
startIndex - the beginning (inclusive) of the range to remove.
endIndex - the end (exclusive) of the range to remove.
IndexOutOfBoundsException - or IllegalArgumentException when startIndex is out of range of this string builder indices or when startIndex > endIndex.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/java.lang.-string-builder/delete-range.html