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If the syntax bit
RE_LIMITED_OPS is set, then Regex doesn't
recognize this operator. Otherwise, if the syntax bit
RE_BK_PLUS_QM isn't set, then `?' represents this operator;
if it is, then `\?' does.
This operator is similar to the match-zero-or-more operator except that
it repeats the preceding regular expression once or not at all;
see section 3.4.1 The Match-zero-or-more Operator (
*), to see what it operates on, how
some syntax bits affect it, and how Regex backtracks to match it.
For example, supposing that `?' represents the match-zero-or-one operator; then `ca?r' matches both `car' and `cr', but nothing else.
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