If you're visually looking at a webpage and there is something clickable and unique on the page, you'll just click it. Without thinking about the page structure. 

I'm interested to see what the most concise xpath is that could be constructed to simulate this in a versatile manner. 

For example, target the "I'm feeling Lucky" button on the Google homepage:

```
//*[contains(@*, 'Lucky')]

```

The above works. But would fail in the element contained Lucky as inner text, or if the wrong case was specified. As such, our xpath needs to cater for any sensitivity and also look for the given string matching inner-text as well.

How could the above xpath be expressed in the most concise yet encompassing structure?