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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
set, then `+' represents this operator; if it is, then `\+'
This operator is similar to the match-zero-or-more operator except that
it repeats the preceding regular expression at least once;
see section 3.4.1 The Match-zero-or-more Operator (
*), for what it operates on, how some
syntax bits affect it, and how Regex backtracks to match it.
For example, supposing that `+' represents the match-one-or-more operator; then `ca+r' matches, e.g., `car' and `caaaar', but not `cr'.
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