Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17887#discussion_r115995239
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -144,7 +151,31 @@ case class Like(left: Expression, right: Expression)
extends StringRegexExpressi
}
@ExpressionDescription(
- usage = "str _FUNC_ regexp - Returns true if `str` matches `regexp`, or
false otherwise.")
+ usage = "str _FUNC_ regexp - Returns true if `str` matches `regexp`, or
false otherwise.",
+ extended = """
+ Arguments:
+ str - a string expression
+ regexp - a string expression. The pattern string should be a Java
regular expression.
+
+ Since Spark 2.0, string literals (including regex patterns) are
unescaped in our SQL parser.
+ For example, if to match "abc\td", a regular expression for
`regexp` can be "^abc\\\\td$".
--- End diff --
OK. Let me change to SQL shell string.
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