RegexTransformer debugging (DIH)

[Jon Baer]

Is there a way to prevent this from occurring (or a way to nail down  
the doc which is causing it?):

INFO: [news] webapp=/solr path=/admin/dataimport  
params={command=status} status=0 QTime=0
Exception in thread "Thread-14" java.lang.StackOverflowError
        at java.util.regex.Pattern$Single.match(Pattern.java:3313)
        at java.util.regex.Pattern$LazyLoop.match(Pattern.java:4763)
        at java.util.regex.Pattern$GroupTail.match(Pattern.java:4637)
        at java.util.regex.Pattern$All.match(Pattern.java:4079)
        at java.util.regex.Pattern$Branch.match(Pattern.java:4538)
        at java.util.regex.Pattern$GroupHead.match(Pattern.java:4578)
        at java.util.regex.Pattern$LazyLoop.match(Pattern.java:4767)
        at java.util.regex.Pattern$GroupTail.match(Pattern.java:4637)
        at java.util.regex.Pattern$All.match(Pattern.java:4079)
        at java.util.regex.Pattern$Branch.match(Pattern.java:4538)
        at java.util.regex.Pattern$GroupHead.match(Pattern.java:4578)
        at java.util.regex.Pattern$LazyLoop.match(Pattern.java:4767)
        at java.util.regex.Pattern$GroupTail.match(Pattern.java:4637)
        at java.util.regex.Pattern$All.match(Pattern.java:4079)
Thanks.

- Jon