根据 Postgres 中的多个分隔符将一列拆分为多行

Question

I have following table in postgres 11.

col1
a;b;c
d/e/f
g and h
i with k
l + m

I would like to split this table based on certain delimiters (/,+,;,and,with]). The desired output is:

col1          col2
a;b;c         a
a;b;c         b
a;b;c         c
d/e/f         d
d/e/f         e
d/e/f         f
g and h       g
g and h       h
i with k      i
i with k      k
l + m         l
l + m         m

I am trying out below query.

select distinct * from table t,
UNNEST(REGEXP_SPLIT_TO_ARRAY(t.col1, '\s+[/|+|;|and|with]\s+')) s(col2)

Answer 1

You may use

[/+;]|\s+(?:and|with)\s+
\s*(?:[/+;]|and|with)\s*

See the regex demo #1 and regex demo #2 .

Details

• [/+;] - a + , / or ; char - | - or
• \s+(?:and|with)\s+ - an and or with words enclosed with one or more whitespaces
• \s*(?:[/+;]|and|with)\s* matches a / , + , ; or and or with strings enclosed with 0 or more whitespace chars.

Note (?:...) is a non-capturing group that is a natural choice when the value matched by a grouping construct is not going to be retrieved/used later.