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when does Regex("1+2") (or "(1)+2" )fail to match "12" ?

<https://www.regexplanet.com/share/index.html?share=yyyydufbmyr>

```
    @Test
    fun asas() {
        assertTrue(Regex("(1)+2").matches("12"))
    }
```
Here it is “matching”.

i found the answer to my question.  it is not visible in the debugger.  Regex.fromLiteral() is the source of pattern above.  something about the Regex object state executes the pattern differently