Brief summary of issue / Description of requested feature:

You can create a line spacer trigger and put a non numeric character in the pattern field

Steps to reproduce the issue / Reasons for adding feature:

1. Make line spacer trigger
2. put 'f' in the pattern
3. save trigger and puzzle

Error output / Expected result of feature

How do you skip 'f' lines? Should be locked down to numbers only

Extra information, such as Mudlet version, operating system and ideas for how to solve / implement:

4.9.1 and latest 4.10 RC