Failed regex search #206

I have tried to search for ἔτους supplied by the editor, such as the one on line 30 of P.Tebt. 1 85:

30 λι(βὸς) ἐχο(μένης) Πτολεμαῖος Πτολεμαίου ι ἀν(ὰ) δ 𐅵 γ´ ιβ´. (ὧν) ε <(ἔτους)> ἐν κλή(ρωι) Ψενή(σιος) ε,

These are the various attempts:

• simply typing <(ἔτους)> in the text search yields over 22 thousand results. it seems to find all the ἔτους contained in papyri.info.
• trying <(ἔτους)> and unchecking the "ignore capitalization" and "ignore diacritics" boxes, it finds 0 documents.
• trying REGEX \<\(ἔτους\)\>, there are again zero results.

I was expecting the REGEX to function... Is this a bug, or a problem with the regex expression?