MondoDB Detector silently discards valid secrets

[steeve85]

The placeholderPasswordPat regex might discard valid passwords that start with xX or ends with *

When testing trufflehog on some mongodb credentials, I noticed that some potential secrets were not properly being identified. This was tested on fake data, but real passwords could also be missed.

At mongodb.go:34:

placeholderPasswordPat = regexp.MustCompile(`^[xX]+|\*+$`)

Using ^[xX]+$|^\*+$ should fix the issue.

I did not have the time to create a PR for this but happy to do it if needed

[TayfurYldz]

I found that #5278 is already an active implementation of this issue. To avoid duplicating work or adding review overhead, I'm stepping back from this one.