cw_regexp_instr_2.sqlx

config { hasOutput: true }
/*
 * Copyright 2022 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

CREATE OR REPLACE FUNCTION ${self()}(haystack STRING, needle STRING) RETURNS INT64 AS (
  CASE WHEN REGEXP_CONTAINS(haystack, needle) THEN
    LENGTH(REGEXP_REPLACE(haystack, CONCAT('(.*?)', needle, '(.*)'), '\\1')) + 1
  WHEN needle IS NULL OR haystack IS NULL THEN
    NULL
  ELSE 0
  END
);