PT11H30M

PT11H

PT2H

PT30M

Pattern.compile("^PT(\d{1,2}H)?(\d{2}M)?$")

val pattern = Pattern.compile("^PT(\d{1,2}H)?(\d{2}M)?$")
    val matcher1 = pattern.matcher("PT11H32M")
    val matcher2 = pattern.matcher("PT11H")
    val matcher3 = pattern.matcher("PT32M")
    if (matcher1.matches()) {
        val groupsCount = matcher1.groupCount()
        android.util.Log.d("foobar", "M1 count [$groupsCount]")
        (0 until groupsCount).forEach {
            val group = matcher1.group(it)
            android.util.Log.d("foobar", "M1, group [$it], [$group]")
        }
    }
    if (matcher2.matches()) {
        val groupsCount = matcher2.groupCount()
        android.util.Log.d("foobar", "M2 count [$groupsCount]")
        (0 until groupsCount).forEach {
            val group = matcher2.group(it)
            android.util.Log.d("foobar", "M2, group [$it], [$group]")
        }
    }
    if (matcher3.matches()) {
        val groupsCount = matcher3.groupCount()
        android.util.Log.d("foobar", "M3 count [$groupsCount]")
        (0 until groupsCount).forEach {
            val group = matcher3.group(it)
            android.util.Log.d("foobar", "M3, group [$it], [$group]")
        }
    }

foobar  : M1 count [2]
foobar  : M1, group [0], [PT11H32M]
foobar  : M1, group [1], [11H]
foobar  : M2 count [2]
foobar  : M2, group [0], [PT11H]
foobar  : M2, group [1], [11H]
foobar  : M3 count [2]
foobar  : M3, group [0], [PT32M]
foobar  : M3, group [1], [null]