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https://issues.apache.org/jira/browse/FLINK-10281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16605936#comment-16605936
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ASF GitHub Bot commented on FLINK-10281:
----------------------------------------
twalthr commented on a change in pull request #6659: [FLINK-10281] [table]
Table function parse regular expression contains backslash failed
URL: https://github.com/apache/flink/pull/6659#discussion_r215673314
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
##########
@@ -186,7 +186,7 @@ object ExpressionParser extends JavaTokenParsers with
PackratParsers {
}
lazy val singleQuoteStringLiteral: Parser[Expression] =
- ("'" + """([^'\p{Cntrl}\\]|\\[\\'"bfnrt]|\\u[a-fA-F0-9]{4})*""" + "'").r
^^ {
+ ("'" + """([^'\p{Cntrl}]|\\[\\'"bfnrt]|\\u[a-fA-F0-9]{4})*""" + "'").r ^^ {
Review comment:
I'm not 100% sure if this is the correct fix. The regular expression has
been adapted from Scala's `JavaTokenParsers`. Maybe we just need to update it
as done
[here](https://github.com/scala/scala-parser-combinators/blob/1.1.x/shared/src/main/scala/scala/util/parsing/combinator/JavaTokenParsers.scala)?
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> Table function parse regular expression contains backslash failed
> -----------------------------------------------------------------
>
> Key: FLINK-10281
> URL: https://issues.apache.org/jira/browse/FLINK-10281
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Major
> Labels: pull-request-available
>
> for example, regular expression matches text ("\w") or number ("\d") :
> {code:java}
> testAllApis(
> "foothebar".regexExtract("foo([\\w]+)", 1), //OK, the method got
> 'foo([\w]+)'
> "'foothebar'.regexExtract('foo([\\\\w]+)', 1)", //failed, the method got
> 'foo([\\w]+)' returns "", but if pass 'foo([\\w]+)' would get compile error.
> "REGEX_EXTRACT('foothebar', 'foo([\\\\w]+)', 1)", //OK, the method got
> 'foo([\w]+)' but must pass four '\'
> "thebar"
> )
> {code}
> the "similar to" function has the same issue.
>
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