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 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.