grafana/public/app/features/alerting/state/selectors.ts

import { AlertRulesState } from 'app/types';

export const getSearchQuery = (state: AlertRulesState) => state.searchQuery;

export const getAlertRuleItems = (state: AlertRulesState) => {
  const regex = new RegExp(state.searchQuery, 'i');

  return state.items.filter(item => {
    return regex.test(item.name) || regex.test(item.stateText) || regex.test(item.info);
  });
};