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    The RegexIterator class

    (PHP 5 >= 5.2.0, PHP 7, PHP 8)

    Introduction

    This iterator can be used to filter another iterator based on a regular expression.

    Class synopsis

    class RegexIterator extends FilterIterator {
    /* Constants */
    public const int USE_KEY;
    public const int INVERT_MATCH;
    public const int MATCH;
    public const int GET_MATCH;
    public const int ALL_MATCHES;
    public const int SPLIT;
    public const int REPLACE;
    /* Properties */
    public ?string $replacement = null;
    /* Methods */
    public __construct(
        Iterator $iterator,
        string $pattern,
        int $mode = RegexIterator::MATCH,
        int $flags = 0,
        int $pregFlags = 0
    )
    public accept(): bool
    public getFlags(): int
    public getMode(): int
    public getPregFlags(): int
    public getRegex(): string
    public setFlags(int $flags): void
    public setMode(int $mode): void
    public setPregFlags(int $pregFlags): void
    /* Inherited methods */
    public FilterIterator::accept(): bool
    public FilterIterator::current(): mixed
    public FilterIterator::key(): mixed
    public FilterIterator::next(): void
    public FilterIterator::rewind(): void
    public FilterIterator::valid(): bool
    public IteratorIterator::current(): mixed
    public IteratorIterator::getInnerIterator(): ?Iterator
    public IteratorIterator::key(): mixed
    public IteratorIterator::next(): void
    public IteratorIterator::rewind(): void
    public IteratorIterator::valid(): bool
    }

    Predefined Constants

    RegexIterator operation modes

    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 Flags

    RegexIterator::USE_KEY

    Special flag: Match the entry key instead of the entry value.

    RegexIterator::INVERT_MATCH

    Inverts the return value of RegexIterator::accept().

    Properties

    replacement

    Table of Contents

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    User Contributed Notes 2 notes

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    33
    jinmoku at hotmail dot com
    14 years ago
    An exemple :

    <?php
    $a     = new ArrayIterator(array('test1', 'test2', 'test3'));
    $i = new RegexIterator($a, '/^(test)(\d+)/', RegexIterator::REPLACE);
    $i->replacement = '$2:$1';
          
    print_r(iterator_to_array($i));
    /*
    Array
    (
        [0] => 1:test
        [1] => 2:test
        [2] => 3:test
    )
    */
    ?>
    up
    1
    chris dot snyder at totara dot com
    1 year ago
    In case the difference between modes RegexIterator::MATCH and RegexIterator::GET_MATCH is not immediately clear:

    MATCH will only return one value per matched element, as a string.

    GET_MATCH will return as many values, per matched element, as there are sub-patterns. If there are sub-patterns, each iteration returns an indexed array with the full pattern match at 0 and each of the sub-pattern matches as another element.

    If there are no sub-patterns, the behaviour of GET_MATCH is the same as MATCH.
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