[jboss-jira] [JBoss JIRA] Resolved: (JBRULES-2992) Could not parse escaped characters

[Edson Tirelli (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edson Tirelli resolved JBRULES-2992.
------------------------------------

    Resolution: Rejected


Thomas, the use of single escapes for regex was deprecated in 5.0 and maintained just for backward compatibility with 4.x during 2 years. With the parser rewrite in 5.2, we thought it was time to remove that and handle escapes the 5.x way (i.e., like in java) with double escapes. 

I am closing this ticket, but if there is a reason to still support single escapes for regex, feel free to reopen this ticket and let us know and we might consider reimplementing the processStringScapes. 



> Could not parse escaped characters
> ----------------------------------
>
>                 Key: JBRULES-2992
>                 URL: https://issues.jboss.org/browse/JBRULES-2992
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.2.0.M2
>            Reporter: Tomáš Schlosser
>            Assignee: Edson Tirelli
>             Fix For: 5.3.0.Beta1
>
>
> When trying to parse rule:
> rule "Regex-A"
> 	when
> 		Person(name matches "\w\w\d{3}\w\w")
> 	then
> 		insert(new Message("Regex-A working"));
> end
> I get following exception:
> Unable to Analyse Expression name ~= "\w\w\d{3}\w\w": [Error: illegal escape sequence: w] [Near : {... name ~= "\w\w\d{3}\w\w" ....}] ^ [Line: 1, Column: 22] : [Rule name='Regex-A']
> use of KnowledgeBuilder property 'drools.parser.processStringEscapes' seems to have no effect. Worked in 5.1

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