Semgrep applies all focus-metavariables, by computing the intersection of each positive range with the range of the metavariable on which we want to focus. Note that metavariables bound by negative patterns are not available here. These conditional operators can only examine the metavariables bound in the positive ranges in step 1, that passed through the filter of negative patterns in step 2. Semgrep evaluates all conditionals, that is metavariable-regexes, metavariable-patterns, and metavariable-comparisons. This results in a strict subset of the positive ranges computed in the previous step. This gives a set of negative ranges which are used to filter the positive ranges. Semgrep evaluates all negative patterns, that is pattern-not-insides, pattern-nots, and pattern-not-regexes. For example, in one range $X can be bound to the function call foo(), and in another range $X can be bound to the expression a + b. The positive ranges carry metavariable bindings. Each range matched by each one of these patterns is intersected with the ranges matched by the other operators. Semgrep evaluates all positive patterns, that is pattern-insides, patterns, pattern-regexes, and pattern-eithers. A patterns operator is always evaluated in the same way: Note that the order in which the child patterns are declared in a patterns operator has no effect on the final result. Try this pattern in the Semgrep Playground. This can be basic expressions like $X = $X or unwanted function calls like hashlib.md5(.). INFIX PRO FIND SINGLE QUOTE CODE
The pattern operator looks for code matching its expression. Keep findings that do not lie inside this patternįilter results using a PCRE-compatible pattern in multiline mode Logical NOT - remove findings matching this expression
Matches metavariables with a pattern formulaĬompare metavariables against basic Python expressions Search metavariables for Python re compatible expressions regex matching is unanchored The below optional fields must reside underneath a patterns field. Keep findings that lie inside this pattern The below optional fields must reside underneath a patterns or pattern-either field. Paths to include or exclude when running this rule Simple search-and-replace autofix functionalityĪrbitrary user-provided data attach data to rules without affecting Semgrep’s behavior
Options object to enable/disable certain matching features Only one of the following is required: pattern, patterns, pattern-either, pattern-regex Language extensions and tags Language
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