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const expr = '/interfaces/interface/bridge-port/priority-regeneration/priority3';

const compareTerm = (term) => {
  if (expr.includes(term)){
    return expr;
  }
};

switch (expr) {
  case 'Test':
    console.log('Test1');
    break;
  case compareTerm('/interfaces/interface/bridge-port/priority-regeneration/priority'):
    console.log('priority',expr);
    break;
  default:
    console.log(`Sorry, we are out of ${expr}.`);
}