CodeQL library for Java
codeql/java-all 0.3.2 (changelog, source)
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Predicate regexMatchedAgainst

Holds if the string literal regex is a regular expression that is matched against the expression str.

As an optimisation, only regexes containing an infinite repitition quatifier (+, *, or {x,}) and therefore may be relevant for ReDoS queries are considered.

Import path

import semmle.code.java.regex.RegexFlowConfigs
predicate regexMatchedAgainst(StringLiteral regex, Expr str)