Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18477#discussion_r146653269
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -375,7 +378,10 @@ case class RegExpReplace(subject: Expression, regexp:
Expression, rep: Expressio
usage = "_FUNC_(str, regexp[, idx]) - Extracts a group that matches
`regexp`.",
extended = """
Examples:
- > SELECT _FUNC_('100-200', '(\d+)-(\d+)', 1);
+ spark-sql> SELECT _FUNC_('100-200', '(\\d+)-(\\d+)', 1);
+ 100
+
+ scala> SELECT _FUNC_('100-200', '(\\\\d+)-(\\\\d+)', 1);
--- End diff --
> scala> spark.sql("SELECT regexp_extract('100-200', '(\\\\d+)-(\\\\d+)',
1)").collect()
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