s = "Ἐν ἀρχῇ ἐποίησεν ὁ θεὸς τὸν οὐρανὸν καὶ τὴν γῆν"
usubstr(s, 25, 11)
τὸν οὐρανὸν
usubstr(s, 25, .)
τὸν οὐρανὸν καὶ τὴν γῆν
usubstr(s, 1, ustrlen(s)-1)
Ἐν ἀρχῇ ἐποίησεν ὁ θεὸς τὸν οὐρανὸν καὶ τὴν γῆ
usubstr(s, -3, .)
γῆν