misc: make regexp validate whole strings (#42843)

wcs/qommon/form.py

@@ -987,8 +987,7 @@ class ValidationWidget(CompositeWidget):
         pattern = cls.get_validation_pattern(validation)
         if pattern:
             def regex_validation(value):
-                match = re.match(pattern, value)
-                return bool(match and match.group() == value)
+                return bool(re.match(r'^(?:%s)$' % pattern, value))
             return regex_validation
         if validation['type'] == 'django':
             def django_validation(value):