[FIX] models: correct regex for onchange_v7

Ensure, we only match the expected az-A-Z characters for old-style
onchanges.
The \w allowed starting with 0-9 which should be prevented.

openerp/models.py

@@ -61,7 +61,7 @@ _unlink = logging.getLogger(__name__ + '.unlink')
 regex_order = re.compile('^(\s*([a-z0-9:_]+|"[a-z0-9:_]+")(\s+(desc|asc))?\s*(,|$))+(?<!,)$', re.I)
 regex_object_name = re.compile(r'^[a-z0-9_.]+$')
 regex_pg_name = re.compile(r'^[a-z_][a-z0-9_$]*$', re.I)
-onchange_v7 = re.compile(r"^(\w+)\((.*)\)$")
+onchange_v7 = re.compile(r"^([a-zA-Z]\w+)\((.*)\)$")
 
 AUTOINIT_RECALCULATE_STORED_FIELDS = 1000