[rules-dev] Regex bug in JDK 5

[Wolfgang Laun]

JDK 5 doesn't handle lookbehind assertions correctly if they contain
alternatives. The fallout from this bug has been cleared up by my release
https://github.com/droolsjbpm/droolsjbpm/commit/f3a50273c91ac697b6f1a0936ce96a44c3b38250

I have added comments to clarify the nature of the "strange" workaround
regex part that's now being used, which also affects the JUnit tests. If JDK
5 is dropped from the has-to-be-compatible-with list of Java releases, the
simpler regex construct might be used again.

Cheers
Wolfgang
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