Dear experts,
   I have an elog with an attribute with fixed values, like this:

Attributes = Half
Options Half = +x, -x, both

It works fine, but I would like to find (or quick filter) all entries with Half=+x .

If I go to the search form, I can select +x from the dropdown menu for Half, but the search returns no result, even if I do have a number of entries with Half=+x. Likewise if I try to do the same with Quick filter.

I believe that this is due to the fact that the search uses regex, and "+" is reserved. I've tried to perform a search by entering manually and escaped "\+x", and it works as intended.

https://.../?mode=summary&reverse=0&reverse=1&npp=20&Half=%5E%5C%2Bx%24

However, since this attribute has a list of fixed values, it is not possible to entry manually something different "\+x" than what is defined in the config, that is "+x".

Is there a solution for this problem?

I would rather not change the attributes options (to, say, positive/negative), since that would mean changing manually a non negligible number of entries.

thanks,
  Stefano