Matthew 27:3

ἰδὼν ὅτι κ.τ.λ. It has been argued from these words that Judas had not expected this result of his treachery. He had hoped that Jesus would by a mighty manifestation of His divine power usher in at once the Kingdom whose coming was too long delayed. The whole tenour of the narrative, however, contradicts such an inference.

μεταμεληθεὶς implies no change of heart or life, but merely remorse or regret that a wiser course had not been followed. Cp. καὶ μετεμέλοντο τὰς σπονδὰς οὐ δεξάμενοι, Thuc. IV. 27; οὐ μεταμέλομαι εἱ καὶ μετεμελόμην, 2 Corinthians 7:8; ὤμοσεν θεὸς καὶ οὐ μεταμεληθήσεται, Hebrews 7:21; also ἀμεταμέλητα γὰρ τὰ χαρίσματα καὶ ἡ κλῆσις τοῦ Θεοῦ, Romans 11:29. See note, ch. Matthew 21:29-30.