Syntax Error occurs in regex #7306
Description
Environment Information
$ jruby -v
jruby 9.3.6.0 (2.6.8) 2022-06-27 7a2cbcd376 Java HotSpot(TM) 64-Bit Server VM 25.341-b10 on 1.8.0_341-b10 +jit [x86_64-darwin]
$ uname -a
Darwin 1-2-240.local 21.5.0 Darwin Kernel Version 21.5.0: Tue Apr 26 21:08:22 PDT 2022; root:xnu-8020.121.3~4/RELEASE_X86_64 x86_64
Expected Behavior
regex.rb
r = /[\§]/
p rThere are no errors with ruby 3.1.2
$ ruby regex.rb
/[§]/
Actual Behavior
$ jruby regex.rb
SyntaxError: regex.rb:1: ASCII-8BIT mixed within UTF-8 source
r = /[\§]/
^