[jboss-jira] [JBoss JIRA] Created: (JBRULES-2434) Emiting regexps in DSLs is unwieldy in the extreme

[Denis Robert (JIRA)]

Emiting regexps in DSLs is unwieldy in the extreme
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                 Key: JBRULES-2434
                 URL: https://jira.jboss.org/jira/browse/JBRULES-2434
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler-DSL
    Affects Versions: 5.0.1.FINAL
         Environment: All
            Reporter: Denis Robert
            Assignee: Mark Proctor
            Priority: Minor


Any regexp emitted by a DSL must be octupled in order to pass through to the DRL and actually work in the rule.

Example: I have a simple rule (I should say: a rule which SHOULD be simple), to test for emails:

[condition][]is not email=not matches "^[\\\\\\\\w-]+(\\\\\\\\.[\\\\\\\\w-]+)*@([a-z0-9-]+(\\\\\\\\.[a-z0-9-]+)*?\\\\\\\\.[a-z]{2,6}|(\\\\\\\\d{1,3}\\\\\\\\.){3}\\\\\\\\d{1,3})(:\\\\\\\\d{4})?$"

As you can see, each backslash is there 8 times. By then time it appears in the resulting DSL, they are doubled (which contrary to docs must be the case, otherwise the regexp does not behave correctly).

Regular expressions should be treated differently throughout Drools. Maybe by using raw strings as in Perl or C#? It's really annoying...


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