Version: 2017.3

Path.GetExtension(string)

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Description

Returns the extension component of the specified path string.

The extension returned includes the . character used to separate the extension from the rest of the path.

using System.IO;
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void Start() { Debug.Log(Path.GetExtension("/Some/File/At/foo.extension")); } }