Ammonite crashes when an string variable contains an escape character

[DavidPerezIngeniero]

If I paste this text into the Ammonite console, it crashes:

Welcome to the Ammonite Repl 2.3.8 (Scala 2.13.3 Java 1.8.0_282)
@ val ansi = "(?:\u001B\\[[0-9;]+m)?" 
ansi: String = "(?:\u001b\\[[0-9;]+m)?"

@ val reError = raw"$ansi(\d\d:\d\d:\d\d$ansi ${ansi}E\)$ansi (.*)".r 
Exception in thread "main" java.lang.IllegalArgumentException: Unknown ansi-escape \[[0-9;]+m)?(\d\d:\d\d:\d\d(?:[[0-9;]+m)? (?:[[0-9;]+m)?E\)(?:[[0-9;]+m)? (.*)
   at index 72 inside string cannot be parsed into an fansi.Str
	at fansi.ErrorMode$Throw$.handle(Fansi.scala:419)
	at fansi.ErrorMode$Throw$.handle(Fansi.scala:407)
	at fansi.Str$.apply(Fansi.scala:272)
	at fansi.Str$.implicitApply(Fansi.scala:227)
	at ammonite.repl.Repl$.$anonfun$showException$1(Repl.scala:304)
	at scala.collection.immutable.List.map(List.scala:246)
	at scala.collection.immutable.List.map(List.scala:79)
	at ammonite.repl.Repl$.showException(Repl.scala:300)
	at ammonite.repl.Repl$.handleRes(Repl.scala:258)
	at ammonite.repl.Repl.loop$1(Repl.scala:215)
	at ammonite.repl.Repl.run(Repl.scala:223)
	at ammonite.Main.$anonfun$run$1(Main.scala:223)
	at scala.Option.getOrElse(Option.scala:201)
	at ammonite.Main.run(Main.scala:211)
	at ammonite.MainRunner.$anonfun$runRepl$1(Main.scala:415)
	at ammonite.MainRunner.watchLoop(Main.scala:396)
	at ammonite.MainRunner.runRepl(Main.scala:415)
	at ammonite.Main$.main0(Main.scala:321)
	at ammonite.Main$.main(Main.scala:270)
	at ammonite.Main.main(Main.scala)

It even crashes one running as a script.

Environment:

• Java 11
• Linux
• Ammonite 2.3.8