Add Expr Helper to return the value of a specific argument in a URI

[AlteredCoder]

What would you like to be added?

Currently we have only the expr helper to parse the URI, but sometimes it is useful to extract only the value of a specific parameter of an URI.

Why is this needed?

This is useful when writing scenario to detect a specific CVE and matching a parameter against libinjection for example

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[github-actions[bot]]

@AlteredCoder: There are no 'kind' label on this issue. You need a 'kind' label to start the triage process.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind bug
• /kind packaging

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.