2 files changed, 37 insertions, 5 deletions

diff --git a/spec/lib/gitlab/regex_spec.rb b/spec/lib/gitlab/regex_spec.rb
index 31de4068bc5..bc0f9e22d50 100644
--- a/spec/lib/gitlab/regex_spec.rb
+++ b/spec/lib/gitlab/regex_spec.rb
@@ -1140,7 +1140,7 @@ RSpec.describe Gitlab::Regex, feature_category: :tooling do
     end
 
     context 'HTML comment lines' do
-      subject { described_class::MARKDOWN_HTML_COMMENT_LINE_REGEX }
+      subject { Gitlab::UntrustedRegexp.new(described_class::MARKDOWN_HTML_COMMENT_LINE_REGEX_UNTRUSTED, multiline: true) }
 
       let(:expected) { [['<!-- an HTML comment -->'], ['<!-- another HTML comment -->']] }
       let(:markdown) do
@@ -1158,20 +1158,20 @@ RSpec.describe Gitlab::Regex, feature_category: :tooling do
       it { is_expected.to match(%(<!-- single line comment -->)) }
       it { is_expected.not_to match(%(<!--\nblock comment\n-->)) }
       it { is_expected.not_to match(%(must start in first column <!-- comment -->)) }
-      it { expect(markdown.scan(subject)).to eq expected }
+      it { expect(subject.scan(markdown)).to eq expected }
     end
 
     context 'HTML comment blocks' do
-      subject { described_class::MARKDOWN_HTML_COMMENT_BLOCK_REGEX }
+      subject { Gitlab::UntrustedRegexp.new(described_class::MARKDOWN_HTML_COMMENT_BLOCK_REGEX_UNTRUSTED, multiline: true) }
 
-      let(:expected) { %(<!-- the start of an HTML comment\n- [ ] list item commented out\n-->) }
+      let(:expected) { %(<!-- the start of an HTML comment\n- [ ] list item commented out\nmore text -->) }
       let(:markdown) do
         <<~MARKDOWN
         Regular text
 
         <!-- the start of an HTML comment
         - [ ] list item commented out
-        -->
+        more text -->
         MARKDOWN
       end
 
diff --git a/spec/lib/gitlab/untrusted_regexp_spec.rb b/spec/lib/gitlab/untrusted_regexp_spec.rb
index 270c4beec97..66675b20107 100644
--- a/spec/lib/gitlab/untrusted_regexp_spec.rb
+++ b/spec/lib/gitlab/untrusted_regexp_spec.rb
@@ -137,6 +137,38 @@ RSpec.describe Gitlab::UntrustedRegexp do
     end
   end
 
+  describe '#extract_named_group' do
+    let(:re) { described_class.new('(?P<name>\w+) (?P<age>\d+)|(?P<name_only>\w+)') }
+    let(:text) { 'Bob 40' }
+
+    it 'returns values for both named groups' do
+      matched = re.scan(text).first
+
+      expect(re.extract_named_group(:name, matched)).to eq 'Bob'
+      expect(re.extract_named_group(:age, matched)).to eq '40'
+    end
+
+    it 'returns nil if there was no match for group' do
+      matched = re.scan('Bob').first
+
+      expect(re.extract_named_group(:name, matched)).to be_nil
+      expect(re.extract_named_group(:age, matched)).to be_nil
+      expect(re.extract_named_group(:name_only, matched)).to eq 'Bob'
+    end
+
+    it 'returns nil if match is nil' do
+      matched = '(?P<age>\d+)'.scan(text).first
+
+      expect(re.extract_named_group(:age, matched)).to be_nil
+    end
+
+    it 'raises if name is not a capture group' do
+      matched = re.scan(text).first
+
+      expect { re.extract_named_group(:foo, matched) }.to raise_error('Invalid named capture group: foo')
+    end
+  end
+
   describe '#match' do
     context 'when there are matches' do
       it 'returns a match object' do