``` println("""\d\d\d\d""".toRegex().matches("1234...

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[gabrielfv]

println("""\d\d\d\d""".toRegex().matches("1234"))                    // Outputs: true
println("""\d\d\d\d""".toRegex(RegexOption.LITERAL).matches("1234")) // Outputs: false

Indeed, the thing here is the LITERAL option.