"/" inside the pattern disables the "Submit" button

The generator available at
https://xsd-forms.herokuapp.com/
creates a form whose "Submit" button does not work when the "pattern" of a string-derived element contains "/".
### Minimal working examples:

a) The defect appears:

```

```

b) The defect does **not** appear (i.e. it works correctly, as it should):

```

```

Both examples comply with the XSD structural rules according to tools such as Oxygen XML Editor.

Tested with Mozilla Firefox 41.0.2 on Microsoft Windows 7.

Open the generator at https://xsd-forms.herokuapp.com/ and reproduce the issue with the first XSD example, then compare it with the working escaped-slash example. Trace how the string-derived pattern reaches the form and verify that the Submit button remains enabled and works for patterns containing '/'.

Written by the indexing model from the issue text.