What's the difference between REGEXP_SUBSTR and REGEXP_EXTRACT?

dba.stackexchange https://dba.stackexchange.com/questions/280599

  •  11-03-2021
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Question

What's the difference between REGEXP_SUBSTR and REGEXP_EXTRACT?

As far as I can tell, they seem to do the same thing. Is there some difference in side-effects, or how they perform for certain inputs? How do I know which to choose?

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Solution

They are both the same function but one was specifically designed for IBM PureData System for Analytics, which is the regexp_extract() function. The other function REGEXP_SUBSTR() is for DB2 only and doesn't exist on PureData System for Analytics.

Use the one that correlates to whichever system you're working in (seems like DB2).

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