FishEye interprets underscore and percent as a wildcard in Users filter

Summary

When filtering Users in FishEye using a literal _, the underscore is interpreted as a wildcard which returns undesirable filter results.

Steps to reproduce

1. Login to FishEye and go to Admin -> Users.
2. If not present already, add users with similar user names. In this case, users y_hei, yah and yeh were added.
3. Add y_h to filter.

Expected Results

Only the y_hei user is returned.

Actual Results

All 3 users are returned (see screenshot attached).

Workaround

Only available from the FishEye version 3.10.3.
The _ character can be escaped with a backslash in the filter. Escaping the underscore causes the filter to return the expected result. (see following screenshot)