Unhandled event loop exception, regex.PatternSyntaxException using valid regular expression

[brita-sed]

Precondition

• .../eclipse.exe has launched.
• iFL plugin has been installed.

Steps

1. Select a project.
2. Click iFL button.
3. Load scores.
4. Click Show filters button.
5. Click Add rule button.
6. Add a Name rule like this:

• Enter string: create???????
• Containment: contains
• Matching: partial
• Case-sensitive: no
• Regular expression: yes

Expected results

• There will be results to this expression like "createProgram" elements.

Received results

• Results in: -
• Error in log: regex_exception_log.txt

!MESSAGE Unhandled event loop exception
!STACK 0
java.util.regex.PatternSyntaxException: Dangling meta character '?' near index 8
create???????
        ^
	at java.util.regex.Pattern.error(Unknown Source)
	at java.util.regex.Pattern.sequence(Unknown Source)
	at java.util.regex.Pattern.expr(Unknown Source)

Related issue:

• After loading scores, added rules should have values, but "-" remained  #185 After loading scores, added rules should have values, but "-" remained

Environment:

• Package: https://github.com/InteractiveFaultLocalization/iFL4Eclipse/releases/tag/V2.general_fixes.2
• Operating System: Windows 10 Pro, 64 bit
• Eclipse version: 2019-09 R (4.13.0)

[brita-sed]

The "create??????" is an invalid expression, but an error message would be better than an exception.

[Dhorvath1294]

https://github.com/InteractiveFaultLocalization/iFL4Eclipse/releases/tag/V3.2.203.1

[brita-sed]

An error popup appeared, and there wasn't any error in log, so the bug has been corrected.