Merge pull request #1168 from alphagov/contact-letter-block

add letter_contact_block edit fields

app/main/forms.py

@@ -486,10 +486,23 @@ class ServiceSmsSender(Form):
     )
 
     def validate_sms_sender(form, field):
-        if field.data and not re.match('^[a-zA-Z0-9\s]+$', field.data):
+        if field.data and not re.match(r'^[a-zA-Z0-9\s]+$', field.data):
             raise ValidationError('Use letters and numbers only')
 
 
+class ServiceLetterContactBlock(Form):
+    letter_contact_block = TextAreaField(
+        'How should users contact you?'
+    )
+
+    def validate_letter_contact_block(form, field):
+        line_count = field.data.strip().count('\n')
+        if line_count >= 10:
+            raise ValidationError(
+                'Contains {} lines, maximum is 10'.format(line_count + 1)
+            )
+
+
 class ServiceBrandingOrg(Form):
 
     def __init__(self, organisations=[], *args, **kwargs):