Describe the bug
It appears that passing a regex causes the validation to fail sometimes
Here's the typings just to show that regexps are allowed:

To Reproduce
FAILS



FAILS

PASSES

Expected behavior
The validation should always pass or always fail
Current behavior
The validation fails sometime (it shouldn't)
Environment:
- Express-validator version: 6.13.0
- Express version: 4.17.1
- Node 14.18.1