String Interpolation
val name = "Link"
// string concatenation
println("Hello " + name)
// string interpolation
println("Hello $name")
// string templates
println("$name.length is ${name.length}") // "Link.lenght is 4"Raw Strings
Raw strings can contain newlines and arbitrary text. It is delimited by a triple quote ("""):
println("""
$name is the hero
of $place
"""
)
// To remove leading whitespace from raw strings use the `trimMargin()`
println("""
|$name is the hero
|of $place
""".trimMargin()
// ^ By default, a pipe symbol `|` is used as margin prefix
)Regular Expressions
A commonly used tool for parsing and working with strings are regular expressions.
// readLine reads a line of input from the stdin
val playerLevelInput = readLine()!! // !! is the "not-null assertion operator"
val regex = playerLevelInput.matches("""\d+""".toRegex())
playerLevel = if (regex) {
playerLevelInput.toInt()
} else {
1
}💡 Behind the scenes, Kotlin’s Regex type uses Java’s Pattern class when targeting the JVM.