Potential fix Badly anchored regular expression

[odaysec]

Regular expressions in Ruby can use anchors to match the beginning and end of a string. However, if the ^ and $ anchors are used, the regular expression can match a single line of a multi-line string. This allows bad actors to bypass your regular expression checks and inject malicious input.

https://ruby-doc.org/3.2.0/Regexp.html#class-Regexp-label-Anchors
CWE-20

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files (and/or docker env variables)
• I have added tests that prove my fix is effective or that my feature works

Related issues

#17163

[mergify]

This pull request does not have a backport label. Could you fix it @odaysec? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• backport-8.x is the label to automatically backport to the 8.x branch.

[mergify]

backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label.