The thing is that the matcher won't read the `\d` ...

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[gabrielfv]

The thing is that the matcher won't read the \d as a regex metacharacter, but solely as \d, and thus will simply try to find it in any given string, which is why

Regex.fromLiteral("""\d\d\d\d""").matches("""\d\d\d\d""") == true