MalformedPatternException seen with OROMatcher regular expression library

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Hi,
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I am using the OROMatcher regular expression library, which is bundled with
WebLogic Server. I am using com.oroinc.text.regex.PatternCompiler to=
 compile
a regular expression. I got the following exception :=0D
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"com.oroinc.text.regex.MalformedPatternException: Unreached characters at
end of expression. Please report this bug!"=0D
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The regular expression that I am trying to compile is :=0D
"/rack=3D([1-9][0-9]|[0-9])(/shelf=3D([1-9][0-9]|[1-9])(/slot=
=3D([1-9][0-9]|[1-9])
(/sub_slot=3D([1-9][0-9]|[1-9]))?)?)?"
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Has anyone seen this problem before ?
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Thanks and Regards,
Prasad.
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