Lazy quantifiers does not considered

```
const ret = require('ret');

let tokens = ret(^\/store\/(?:([^\/]+?)));
```

Question mark after the plus in the regex is a [lazy quantifier](https://www.regular-expressions.info/repeat.html#lazy) but it is considered as optional identifier, and in the result:

`{
"type": 0,
"stack": [
{
....
{
"type": 1,
"stack": [
{
"type": 1,
"stack": [
{
"type": 5,
"min": 0 #this mean that it is optional,
"max": 1,
"value": {
...
}
}
}
]
...
}
]
}`