juandebravo · February 7, 2012 23:35 · Feb 7, 2012
diff --git a/main_re.py b/main_re.py
@@ -0,0 +1,41 @@
+import re
+import json
+
+def add_underscore(letter):
+  return "_"+letter.group(0).lower()
+
+def to_lower(letter):
+  return letter.group(0).lower()
+
+def cast_to_underscore_case(value):
+  if isinstance(value, str):
+    return re.sub(r'([A-Z])', add_underscore, value)
+
+  elif isinstance(value, dict):
+    _values = {}
+    for (k, v) in value.items():
+      _k = re.sub(r'([A-Z]){2,}', to_lower, k)
+      _k = re.sub(r'\A([A-Z])', to_lower, _k)
+      _k = re.sub(r'(?<=.)([A-Z])[a-z]', add_underscore, _k)
+      _k = re.sub(r'(?<=.)([A-Z]$)', add_underscore, _k)
+      _values[_k] = v
+    return _values
+
+  else:
+    raise TypeError("Unexpected type {}".format(type(value)))
+
+if __name__ == "__main__":
+  values = [
+    {"IsCustomer": True, "OBID": 12345}, 
+    {"isCustomer": True, "obid": 12345},
+    {"iscustomer": True, "obid": 12345},
+    {"is_customer": True, "obid": 12345},
+    {"isCustomer": True, "oBiD": 12345},
+    {"isCustomer": True, "Obid": 12345}
+  ]
+
+  for val in values:
+    print "-------------\n"
+    print val
+    print "->" 
+    print cast_to_underscore_case(val)