[ruby/rubygems] Fix quote handling in mise format ruby version parsing

The previous regex didn't properly match quoted strings
it would capture the opening quote as part of the version
if quotes were mismatched.
This change properly parses double-quoted, single-quoted,
and unquoted version strings separately.

ruby/rubygems@81e48c8185

Author: hituzi-no-sippo

lib/bundler/ruby_dsl.rb

@@ -43,17 +43,20 @@ def ruby(*ruby_version)
     def normalize_ruby_file(filename)
       file_content = Bundler.read_file(gemfile.dirname.join(filename))
       # match "ruby-3.2.2", ruby = "3.2.2", ruby = '3.2.2' or "ruby   3.2.2" capturing version string up to the first space or comment
-      if /^                    # Start of line
-         ruby                  # Literal "ruby"
-         [\s-]*                # Optional whitespace or hyphens (for "ruby-3.2.2" format)
-         (?:=\s*)?             # Optional equals sign with whitespace (for ruby = "3.2.2" format)
-         ["']?                 # Optional opening quote
-         (                     # Start capturing group
-           [^\s#"']+           # One or more chars that aren't spaces, #, or quotes
-         )                     # End capturing group
-         ["']?                 # Optional closing quote
-         /x.match(file_content)
-        $1
+      version_match = /^               # Start of line
+                      ruby             # Literal "ruby"
+                      [\s-]*           # Optional whitespace or hyphens (for "ruby-3.2.2" format)
+                      (?:=\s*)?        # Optional equals sign with whitespace (for ruby = "3.2.2" format)
+                      (?:
+                        "([^"]+)"      # Double quoted version
+                        |
+                        '([^']+)'      # Single quoted version
+                        |
+                        ([^\s#"']+)    # Unquoted version
+                      )
+                      /x.match(file_content)
+      if version_match
+        version_match[1] || version_match[2] || version_match[3]
       else
         file_content.strip
       end

spec/bundler/bundler/ruby_dsl_spec.rb

@@ -193,6 +193,19 @@ class MockDSL
 
           it_behaves_like "it stores the ruby version"
         end
+
+        context "with mismatched quotes" do
+          let(:file_content) do
+            <<~TOML
+              [tools]
+              ruby = "#{version}'
+            TOML
+          end
+
+          it "raises an error" do
+            expect { subject }.to raise_error(Bundler::InvalidArgumentError, "= is not a valid requirement on the Ruby version")
+          end
+        end
       end
 
       context "with a .tool-versions file format" do