Add regression test for regexp issue filed via GitHub

Author: jirkamarsik

spec/truffle/regressions_spec.rb

@@ -0,0 +1,37 @@
+# Copyright (c) 2021, 2021 Oracle and/or its affiliates. All rights reserved. This
+# code is released under a tri EPL/GPL/LGPL license. You can use it,
+# redistribute it and/or modify it under the terms of the:
+#
+# Eclipse Public License version 2.0, or
+# GNU General Public License version 2, or
+# GNU Lesser General Public License version 2.1.
+
+require_relative '../ruby/spec_helper'
+
+describe "Regression test suite" do
+  it "fixes GitHub issue 2204" do
+    /\A([0-9]+)_([_a-z0-9]*)\.?([_a-z0-9]*)?\.rb\z/.match("20190116152522_enable_postgis_extension.rb").to_a.should ==
+      ["20190116152522_enable_postgis_extension.rb", "20190116152522", "enable_postgis_extension", ""]
+
+    /\A([0-9]+)_([_a-z0-9]*)\.?([_a-z0-9]*)?\.rb\z/.match("20190116152523_create_schools.rb").to_a.should ==
+      ["20190116152523_create_schools.rb", "20190116152523", "create_schools", ""]
+
+    /^0{2}?(00)?(44)?(0)?([1-357-9]\d{9}|[18]\d{8}|8\d{6})$/.match("07123456789").to_a.should ==
+      ["07123456789", nil, nil, "0", "7123456789"]
+
+    /^0{2}?(00)?44/.match("447123456789").to_a.should ==
+      ["44", nil]
+
+    /^0{2}?(00)?(44)(0)?([1-357-9]\d{9}|[18]\d{8}|8\d{6})$/.match("447123456789").to_a.should ==
+      ["447123456789", nil, "44", nil, "7123456789"]
+
+    /^0{2}?(00)?(44)?(0)?([1-357-9]\d{9}|[18]\d{8}|8\d{6})$/.match("07123456789").to_a.should ==
+      ["07123456789", nil, nil, "0", "7123456789"]
+
+    /^0{2}?(00)?44/.match("447123456789").to_a.should ==
+      ["44", nil]
+
+    /^0{2}?(00)?(44)(0)?([1-357-9]\d{9}|[18]\d{8}|8\d{6})$/.match("447123456789").to_a.should ==
+      ["447123456789", nil, "44", nil, "7123456789"]
+  end
+end