Semgrep Basics

Which of the following is a pattern operator that can be used to match one of two patterns?

Which of the following is an example of a pattern either rule?

Which of the following is a Semgrep operator that can be used to match zero or more of the same item?

"metadata" block is required in every Semgrep rule.

Which field in a Semgrep rule defines the pattern to be matched in the code?