Using Xano Pattern filter (Regex) doesn't give expected results

I've added a column with a Pattern filter, as such:

The pattern is: `/ b(1[0-2]|0?[1-9]):[0-5][0-9] [AP][M] b`

Il also tried ` b(1[0-2]|0?[1-9]):[0-5][0-9] [AP][M] b`

But it doesn't work, I can write any kind of text in the column, it doesn't get rejected.

Although, I've tested that regex at https://regexr.com/7i09e and it provides expected results.

Does Xano expect a different format?