SpoilerText-DetectText.kt

var text = editText.text.toString()

// Save the original text without the tags
val original = text.replace(spoilerTag, "")

// Get the character ranges
val ranges = mutableListOf<Pair<Int, Int>>()
while (text.contains(spoilerTag)) {
    // Get start and end of spoiler tags
    val start = text.indexOf(spoilerTag)
    val end = text.indexOf(spoilerTag, start + spoilerTag.length) - spoilerTag.length
    
    ranges.add(Pair(start, end))

    // Remove starting spoiler tags
    // This is intentionally done before checking if an end tag exists to prevent an infinite loop
    text = text.replaceRange(start, start + spoilerTag.length, "")

    // If there is no end tag, the text was badly formatted
    if (end <= start) continue

    // Remove ending spoiler tags
    text = text.replaceRange(end, end + spoilerTag.length, "")
}