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Syntax highlight of Ruby is broken on percent notations #140

Description

@alexr00

Originally from @takaram in microsoft/vscode#137713

Does this issue occur when all extensions are disabled?: Yes

  • VS Code Version: 1.62.3, 1.63.0-insider
  • OS Version: Windows_NT x64 10.0.19042

Steps to Reproduce:

  1. Create .rb file
  2. Input code like below
puts %(() parentheses)
puts %<{} braces>
puts %Q{[] brackets}
puts %r[[^a-z]]
puts %(
  def foo()
    puts 123
  rescue
    nil
  end
)
puts %x(echo '() parentheses')

Expected:
The literal is recognized as strings (or regexp) until the closing bracket.
Specification of Ruby percent notations: http://www.chrisrolle.com/en/blog/ruby-percentage-notations

Actual:
image

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