[BugFix]Fix unclear error messages when an unsupported regex type is …

[wuyanxing]

…used.

Why I'm doing:

select 'a' RLIKE '([A-Za-z0-9]+[\\u4e00-\\u9fa5]{2}[A-Za-z0-9]+)';
before:
ERROR 1064 (HY000): error parsing regexp: invalid escape sequence: \u
after fix:
ERROR 1064 (HY000): Getting analyzing error from line 1, column 11 to line 1, column 17. Detail message: Invalid regular expression in ''a' REGEXP '([A-Za-z0-9]+[\u4e00-\u9fa5]{2}[A-Za-z0-9]+)''.

What I'm doing:

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.5
  • 3.4
  • 3.3
  • 3.2
  • 3.1

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stephen-shelby]

I can't reproduce your case in main branch. And I can see the exact error message. Can you give some other examples?

[wuyanxing]

I can't reproduce your case in main branch. And I can see the exact error message. Can you give some other examples?

starrocks/fe/fe-core/src/main/java/com/starrocks/sql/analyzer/ExpressionAnalyzer.java

Line 946 in e920935

} catch (PatternSyntaxException e) {

the Exception is :
com.google.re2j.PatternSyntaxException: error parsing regexp: invalid escape sequence: \u
at com.google.re2j.Parser.parseEscape(Parser.java:1439) ~[re2j-1.1.jar:?]
at com.google.re2j.Parser.parseClassChar(Parser.java:1455) ~[re2j-1.1.jar:?]
at com.google.re2j.Parser.parseClass(Parser.java:1664) ~[re2j-1.1.jar:?]
at com.google.re2j.Parser.parseInternal(Parser.java:870) ~[re2j-1.1.jar:?]
at com.google.re2j.Parser.parse(Parser.java:802) ~[re2j-1.1.jar:?]
at com.google.re2j.RE2.compileImpl(RE2.java:183) ~[re2j-1.1.jar:?]
at com.google.re2j.Pattern.compile(Pattern.java:136) ~[re2j-1.1.jar:?]
at com.google.re2j.Pattern.compile(Pattern.java:96) ~[re2j-1.1.jar:?]

PatternSyntaxException is java.util.regex.PatternSyntaxException，but Pattern is com.google.re2j.Pattern.
I updated the code to throw com.google.re2j.PatternSyntaxException instead of java.util.regex.PatternSyntaxException, to ensure consistency with the RE2J regex engine being used.

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[stephen-shelby]

select 'a' RLIKE '([A-Za-z0-9]+[\u4e00-\u9fa5]{2}[A-Za-z0-9]+)';

I mean I can't reproduce your case in main branch.

mysql> select 'a' RLIKE '([A-Za-z0-9]+[\u4e00-\u9fa5]{2}[A-Za-z0-9]+)';
+---------------------------------------------------------+
| 'a' REGEXP '([A-Za-z0-9]+[u4e00-u9fa5]{2}[A-Za-z0-9]+)' |
+---------------------------------------------------------+
|                                                       0 |
+---------------------------------------------------------+

could your test it with main branch?

[wuyanxing]

select 'a' RLIKE '([A-Za-z0-9]+[\u4e00-\u9fa5]{2}[A-Za-z0-9]+)';

I mean I can't reproduce your case in main branch.

mysql> select 'a' RLIKE '([A-Za-z0-9]+[\u4e00-\u9fa5]{2}[A-Za-z0-9]+)';
+---------------------------------------------------------+
| 'a' REGEXP '([A-Za-z0-9]+[u4e00-u9fa5]{2}[A-Za-z0-9]+)' |
+---------------------------------------------------------+
|                                                       0 |
+---------------------------------------------------------+

could your test it with main branch?

sry, I wrote the wrong SQL,try the one below instead.
select 'a' RLIKE '([A-Za-z0-9]+[\\u4e00-\\u9fa5]{2}[A-Za-z0-9]+)';