Redmine

We are using Redmine to track failures of our equipment in the field. Instead of having dozens of different fields, some of which only apply to certain types of equipment, I would like to try to have a failure description that can only use a limited number of words from a dictionary. I would like to do this with a regular expression, but I need to know how long the expression can be. I expect that there will be several dozen words, and each word will be 5-10 characters. So we are probably looking at a regex that is about 2k.

What is the maximum length of the RegEx field?

Thank you for your help.

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Brian