Hi, While evaluating an _expression_ against the following pattern, libxml is returning an internal error. The Pattern is -(conf:[a-zA-Z0-9.:_\-]+|conn:[a-zA-Z0-9.:_\-]+)/dialog:[a-zA-Z0-9.:_\-]+ The _expression_ is -conn:10600-0-3689-217.198.224.50.5060 While debugging I found that it fails in xmlFARegExecRollBack function because of a rollback on an empty stack…. Is this a problem? Thanks!! Regards Ashwin
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