Update regular-expression-patterns.md

[ErikPohl444]

Even the Scala 3 requires curly braces when I run it in Scastie.

Is this a problem with Scastie's default build [which uses Scala 3] or with the sample code -- which I just fixed?

I'm guessing based on my 0 experience with Scala that use of the imported function causes an inference which requires the curly braces.

Kept getting “error: recursive value $t needs type” in Scastie using Scala 3 without this fix. Took it as a learning exercise to find out why.

[gkepka]

What solves the problem and results in imho a more idiomatic code is to first store the message in a variable and then print it:

val message = numberPattern.findFirstMatchIn("awesomepassword") match
  case Some(_) => "Password OK"
  case None => "Password must contain a number"

println(message)

[adpi2]

Same as #3133

It seems it is a bug in Scastie and we are going to fix it.

[ErikPohl444]

Thanks. I copied the more idiomatic snippet to learn from. I appreciate the follow-up.