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The first sub-pattern in an OR group is always true.
or
The first sub-pattern in an AND group is always false.
In the sub-pattern, (WHITE-SPACE* OR a)
, sub-pattern
a
will never be consulted, since the first part always is
matched, even if only zero times.
In the sub-pattern, ((LOOKAHEAD NOT WHITE-SPACE*) b
, the
lookahead-not
part always fails, so OmniMark never attempts to
match sub-pattern b
.
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