Matthew 27:3 Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, 27:4 Saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? see thou to that. 27:5 And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.
Although...
1- That word there is the word metamelomai.
Which means to regret.
2- In contrast to the word metanoeó.
Which means to change one's mind.
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metamelomai - to regret...
Matthew 27:3 Then Judas, which had betrayed him, when he saw that he was condemned, repented (metamelomai) himself, and brought again the thirty pieces of silver to the chief priests and elders, 27:4 Saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? see thou to that. 27:5 And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.
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metanoeó - to change one's mind...
Mark 1:14 Now after that John was put in prison, Jesus came into Galilee, preaching the gospel of the kingdom of God, 1:15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent (metanoeó) ye, and believe the gospel.