[issue19138] doctest.IGNORE_EXCEPTION_DETAIL doesn't match when no detail exists

[Tim Peters]

Tim Peters added the comment:

On second thought, I don't want to use a regexp for this.  The mandatory colon _was_ a kind of absolute wall, and the various instances of "[^:]" exploited that to avoid unintended matches.

But "possibly dotted name followed possibly by a colon" is straightforward to get right with a pair of simple string searches, so I'll introduce a new `_strip_exception_details()` function instead.

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<http://bugs.python.org/issue19138>
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