regexp_extract function

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Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime

Extracts the first string in str that matches the regexp expression and corresponds to the regex group index.

Syntax

regexp_extract(str, regexp [, idx] )

Arguments

  • str: A STRING expression to be matched.
  • regexp: A STRING expression with a matching pattern.
  • idx: An optional integral number expression greater or equal 0 with default 1.

Returns

A STRING.

The regexp string must be a Java regular expression.

When using literals, use raw-literal (r prefix) to avoid escape character pre-processing.

regexp may contain multiple groups. idx indicates which regex group to extract. An idx of 0 means matching the entire regular expression.

Examples

> SELECT regexp_extract('100-200', '(\\d+)-(\\d+)', 1);
 100