The search is sensitive to diacritics. The following characters have to be typed in Unicode (or copied from here):

 

    ˀ    ˁ    á    ã        ḏ    ḏ̣    é    ẽ    ɛ    έ    ə    ə́    γ     ḥ    ḫ    ʰ    í        ḳ    ľ    ḷ    ó    ö    ö́   ᵒ    ɔ    ɔ́    š    ṣ    ṣ̌    ŝ    ṯ    ṭ    ú    ʸ    ẓ̂    ž

 

The base is searchable by regular expressions. For example, ^ can be used for indicating the starting position within the string, \b can be used for indicating word boundaries, and . (a point) can be used as the wildcard.