Parsing error when using [ and " inside interpolation

[seballot]

Dear team,

Thank you so much for this amazing tool

A small issue I have run into, with this kind of code

I18n.t("my.translation.#{mapping["key"]}")

The presence of both [ + " make this kind of error to be displayed when I run I18n-tasks unused

/usr/local/bundle/gems/i18n-tasks-1.0.12/lib/i18n/tasks/key_pattern_matching.rb:28:in `compile_key_pattern': premature end of char-class: /\\A(my\\.translation\\.mapping[)\\z/ (RegexpError)

If I use single quote it works

I18n.t("my.translation.#{mapping['key']}")

Best regards,
Sebastian

[davidwessman]

In what kind of a file did you get this error? 🙂
Could you also add your config/i18n-tasks.yml?

[carlosmedrano97]

I'm having the same issue, I'm using the default i18n-tasks.yml file, with ruby 2.7.6 and rails 6.0.6.1

The following does not fail with an html.erb

<% [{"key" => 0},{"key" => 1}, {"key" => 2}, {"key" => 3}].each do |n| %>
  <p> <%=I18n.t("test.N#{n["key"]}")%></p>
<%end%>

But the same fails with an html.haml

- [{"key" => 0},{"key" => 1}, {"key" => 2}, {"key" => 3}].each do |n|
  %p= I18n.t("test.N#{n["key"]}")

The translation file is really simple:

en:
  test:
    N0: Test 0
    N1: Test 1
    N2: Test 2
    N3: Test 3

And this is the error that is throwing:

Error:
I18nTest#test_no_unused_keys:
RegexpError: premature end of char-class: /\A(test\.Nn[)\z/
    test/i18n_test.rb:17:in `test_no_unused_keys'