CAS text validation rules seem to have changed

[timhunt]

We have a question with the question text below: It used to work. Now, when you try to save the editing form, or preview the question, you get a validation error:

CASText failed validation. CAS commands not valid.
The characters @, $ and \ are not allowed in CAS input.

Any clues? (We are on latest master, a few commits ahead of 3.5.6). Thanks.

---

The triangle (ABC) has angle (@angle1@ = @vangle1@^\circ), angle (@angle2@ = @\vangle2@^\circ) and side (@Side2@) of length @vside2@, where the angles (A), (B) and (C) and sides (a), (b) and (c) are labelled as shown below.

A triangle with vertices capital A, capital B and capital C and sides lower case ay, lower case b and lower case c. The side opposite the vertex A is labelled lower case ay, the side opposite the vertex B is labelled lower case b and the side opposite the vertex C is labelled lower case c.

Find the length of side (@side1@). Give your answer as a decimal number to one decimal place.

(@side1@) = [[input:ans1]]

[[validation:ans1]]

[aharjula]

@\vangle2@

[sangwinc]

Yes Tim, we stopped adding in ""s here:
57d36c3

I think this is a bug in your question perhaps? If so, can we close this?
Chris

[timhunt]

Confirmed, these were buggy questions, and are now fixed at our end.