fun CharSequence.indexOf( char: Char, startIndex: Int = 0, ignoreCase: Boolean = false ): Int
Returns the index within this string of the first occurrence of the specified character, starting from the specified startIndex.
ignoreCase - true to ignore character case when matching a character. By default false.
Return An index of the first occurrence of char or -1 if none is found.
fun CharSequence.indexOf( string: String, startIndex: Int = 0, ignoreCase: Boolean = false ): Int
Returns the index within this char sequence of the first occurrence of the specified string, starting from the specified startIndex.
ignoreCase - true to ignore character case when matching a string. By default false.
Return An index of the first occurrence of string or -1 if none is found.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/index-of.html