Hive REGEXP_EXTRACT extract the second occurrence of a pattern [duplicate] - regex

Question

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hive regexp_extract weirdness
(2 answers)
Closed 4 years ago.
I am querying data in Hive and extracting a code from a column. I recently discovered that due to data entry/business process issues, users have been overloading the field and entering two separate job codes when there should only be one.
Sample data from the column:
NOV2 WAA UW FOO DISPLAY_W2100008/ SOMETHING DISPLAY W2100106
I've been using REGEXP_EXTRACT(column,'([A-Z]\\d{7})',1) as id will correctly extract the first code W2100008, but I am unable to extract the second code W21001061.
I want to use REGEXP_EXTRACT twice and alias id_1 and id_2 so we can analyze the second codes referenced. Is there a way to reference the second time the pattern is matched?
REGEXP_EXTRACT(column,'_([A-Z]\\d{7})',0) returns the first match
REGEXP_EXTRACT(column,'([A-Z]\\d{7})',1) returns the first match
REGEXP_EXTRACT(column,'([A-Z]\\d{7})',2) returns an error
The extracted value will be used to join to another column, so the result needs to return a single value, not an array.

Answer 1

Replace all '.*?([A-Z]\\d{7})' with delimiter(space) + ([A-Z]\\d{7}). Remove first space using trim, split by ' ' to get array:
hive> select split(trim(regexp_replace('NOV2 WAA UW FOO DISPLAY_W2100008/SOMETHING DISPLAY W2100106','.*?([A-Z]\\d{7})',' $1')),' ');
OK
["W2100008","W2100106"]
Get first element:
hive> select split(trim(regexp_replace('NOV2 WAA UW FOO DISPLAY_W2100008/ SOMETHING DISPLAY W2100106','.*?([A-Z]\\d{7})',' $1')),' ')[0];
OK
W2100008
Time taken: 0.065 seconds, Fetched: 1 row(s)
And second element is
split(trim(regexp_replace('NOV2 WAA UW FOO DISPLAY_W2100008/ SOMETHING DISPLAY W2100106','.*?([A-Z]\\d{7})',' $1')),' ')[1]
better use subquery to parse array one time.
select display_array[0] as id_1 , display_array[1] as id_2
from
(
select split(trim(regexp_replace('NOV2 WAA UW FOO DISPLAY_W2100008/ SOMETHING DISPLAY W2100106','.*?([A-Z]\\d{7})',' $1')),' ') as display_array
)s;
Use explode() if you want each element per row.