You can fin-tune the regular expressions for special characters in Pages since our 4.1 official release. Please take a look at this forum thread
which contains a discussion on the topic. I hope this information helps, if you have any additional questions, please do not hesitate to let us know.
All the best,
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items