Use extended regexp flag for `git grep`-ing filesrs-issue-3055

Closes #3055

2 files changed, 7 insertions, 1 deletions

diff --git a/app/models/repository.rb b/app/models/repository.rb
index 3716ea6ad6c..ca62fbbdf04 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -854,7 +854,7 @@ class Repository
 
   def search_files(query, ref)
     offset = 2
-    args = %W(#{Gitlab.config.git.bin_path} grep -i -I -n --before-context #{offset} --after-context #{offset} -e #{Regexp.escape(query)} #{ref || root_ref})
+    args = %W(#{Gitlab.config.git.bin_path} grep -i -I -n --before-context #{offset} --after-context #{offset} -E -e #{Regexp.escape(query)} #{ref || root_ref})
     Gitlab::Popen.popen(args, path_to_repo).first.scrub.split(/^--$/)
   end
 
diff --git a/spec/models/repository_spec.rb b/spec/models/repository_spec.rb
index 34a13f9b5c9..7c94f3639d4 100644
--- a/spec/models/repository_spec.rb
+++ b/spec/models/repository_spec.rb
@@ -100,6 +100,12 @@ describe Repository, models: true do
       expect(results.first).not_to start_with('fatal:')
     end
 
+    it 'properly handles an unmatched parenthesis' do
+      results = repository.search_files("test(", 'master')
+
+      expect(results.first).not_to start_with('fatal:')
+    end
+
     describe 'result' do
       subject { results.first }