Regular expression pattern invalid

[johnf_dfs]

I want to allow up to 3 letters as a Global Attribute.  But when I put in the regex pattern [A-Z]{1,3} to validate values, AbanteCart returns error message "Regular Expression Pattern is invalid!".

What am I doing wrong?

---John---

[abolabo]

try to add slashes

Code: [Select]

/[A-Z]{1,3}/