Question: I am trying to extract from the string the following:

Original string: `M 1,81 PRT 25 12 1988`

I want to extract: `25 12 1988`

Basically `2numbers|space|2numbers|space|4numbers`

I am struggling to do it, so far i got to this but my little experience with `regex` keeps me from finishing it.

Tried with this regex: 

```
(?<!\S)\w+(?!\S)

```

Answer: 
This will return the captured data as a group, and will work regardless of the whitespace character used.

```
(\d{2}\s\d{2}\s\d{4})

```

Go to regex101.com and try it out. It's a good way to build your expressions.
This is a pretty easy one:

`(\d{2} \d{2} \d{4})`

Quite self-explanatory. `\d` means a digit, and `{N}` means the count.