void (RegExpPattern pattern) { final RegExpBranch[] branches = pattern.getBranches(); if (branches.length < 2) { return; } final Set<RegExpBranch> reported = new HashSet<>(2); for (int i = 0; i < branches.length - 1; i++) { final RegExpBranch branch1 = branches[i]; if (branch1.getAtoms().length == 0) { continue; } for (int j = i + 1; j < branches.length; j++) { final RegExpBranch branch2 = branches[j]; if (RegExpEquivalenceChecker.areElementsEquivalent(branch1, branch2)) { if (reported.add(branch1) && myIsOnTheFly) { registerProblem(branch1); } if (reported.add(branch2)) { registerProblem(branch2); } } } } }