Reduce dependencies of vm and parser crates

Lib/re.py

@@ -0,0 +1,11 @@
+
+""" Regular expressions """
+
+
+def match(pattern, string, flags=0):
+    return _compile(pattern, flags).match(string)
+
+
+def _compile(pattern, flags):
+    p = sre_compile.compile(pattern, flags)
+    return p