Why stop there? In fact one should expect full support for regular expression searching. This feature set is among the most basic and would allow for complex pattern matching. Google regex for more information.

Essential and why not? Is there any valid reason for not including this feature?

Please consider voting up the Full Regular Expression search feature.
http://thebrain.uservoice.com/pages/4597-personalbrain/suggestions/75424-provide-regular-expressions-in-all-searches?ref=title

I just managed to steal a vote from another suggestion, so here you go - one vote!
Votes around here seem to be as precious as hen's teeth, as the saying goes.

Great suggestion Antonio68! I think this is absolutely essential and would like to have given it 3 votes except that this silly system tells me I have 0 votes left. :(

Without noticing your suggestion here, i made a similar post in the main forum:
http://websitetoolbox.com/tool/post/thebrain/vpost?id=3182994

Without full wildcard search, searching in PersonalBrain is still very primitive.

I think this will be a very omportant search function for big brain, and I hope this search function will be made available at least for the thought names.

Regex search would be really great.

this simple idea is very important. PersonalBrain (or any other info system) is about getting to the info. Have used Locate32 to great results because of the very simplicity of using "*" and "?" wildcards and prefixing all files with yy-mm-dd format (similar to the Timeline request). Locate easily find words buried in other words. It you can't find what you need, what's the use?