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(PHP 5 >= 5.2.0, PHP 7, PHP 8)
This iterator can be used to filter another iterator based on a regular expression.
RegexIterator::ALL_MATCHES
Return all matches for the current entry (see preg_match_all()).
RegexIterator::GET_MATCH
Return the first match for the current entry (see preg_match()).
RegexIterator::MATCH
Only execute match (filter) for the current entry (see preg_match()).
RegexIterator::REPLACE
Replace the current entry (see preg_replace(); Not fully implemented yet)
RegexIterator::SPLIT
Returns the split values for the current entry (see preg_split()).
RegexIterator::USE_KEY
Special flag: Match the entry key instead of the entry value.
RegexIterator::INVERT_MATCH
Inverts the return value of RegexIterator::accept().