A few more pattern tests.

tests/test_model.py

@@ -402,6 +402,8 @@ def test_xpath(instance):
     xptest("string(round(0 div 0))", "NaN")
     xptest("re-match(//leafE, '[0-9a-fA-F]*')")
     xptest("re-match(count(//leafE), '[0-9]*')")
+    xptest("re-match('1.22.333', '\d{1,3}\.\d{1,3}\.\d{1,3}')")
+    xptest("re-match('aaax', 'a*')", False)
     xptest("re-match('a\nb', '.*')", False)
     xptest("re-match('a\nb', '[a-z\n]*')")