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Extract query parameters from a URL as ARRAY in BigQuery
#standardSQL
# Extract query parameters from a URL as ARRAY in BigQuery; standard-sql; 2018-04-08
# @see http://www.pascallandau.com/bigquery-snippets/extract-url-parameters-array/
WITH examples AS (
SELECT 1 AS id,
'?foo=bar' AS query,
'simple' AS description
UNION ALL SELECT 2, '?foo=bar&bar=baz', 'multiple params'
UNION ALL SELECT 3, '?foo[]=bar&foo[]=baz', 'arrays'
UNION ALL SELECT 4, '', 'no query'
)
SELECT
id,
query,
REGEXP_EXTRACT_ALL(query,r'(?:\?|&)((?:[^=]+)=(?:[^&]*))') as params,
REGEXP_EXTRACT_ALL(query,r'(?:\?|&)(?:([^=]+)=(?:[^&]*))') as keys,
REGEXP_EXTRACT_ALL(query,r'(?:\?|&)(?:(?:[^=]+)=([^&]*))') as values,
description
FROM examples
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