Creates a new RecursiveRegexIterator.

RecursiveRegexIterator
RecursiveRegexIterator::getChildren
RecursiveRegexIterator
PHP Manual

# RecursiveRegexIterator::__construct

(PHP 5 >= 5.2.0)

RecursiveRegexIterator::__construct — Creates a new RecursiveRegexIterator.

### Description

public RecursiveRegexIterator::__construct() ( RecursiveIterator `$iterator` , string `$regex` [, int `$mode` = self::MATCH [, int `$flags` = 0 [, int `$preg_flags` = 0 ]]] )

Creates a new regular expression iterator.

### Parameters

`iterator`

  The recursive iterator to apply this regex filter to.

`regex`

  The regular expression to match.

`mode`

  Operation mode, see RegexIterator::setMode() for a list of modes.

`flags`

  Special flags, see RegexIterator::setFlags() for a list of available flags.

`preg_flags`

  The regular expression flags. These flags depend on the operation mode parameter:

  RegexIterator preg_flags
  operation mode | available flags
  --- | ---
  RecursiveRegexIterator::ALL_MATCHES | See preg_match_all().
  RecursiveRegexIterator::GET_MATCH | See preg_match().
  RecursiveRegexIterator::MATCH | See preg_match().
  RecursiveRegexIterator::REPLACE | none.
  RecursiveRegexIterator::SPLIT | See preg_split().

### Examples

Example #1 RecursiveRegexIterator::__construct() example

Creates a new RegexIterator that filters all strings that start with 'test'.

`<?php
$rArrayIterator = new RecursiveArrayIterator(array('test1', array('tet3', 'test4', 'test5')));
$rRegexIterator = new RecursiveRegexIterator($rArrayIterator, '/^test/',
RecursiveRegexIterator::ALL_MATCHES);
foreach ($rRegexIterator as $key1 => $value1) {
if ($rRegexIterator->hasChildren()) {
// print all children
echo "Children: ";
foreach ($rRegexIterator->getChildren() as $key => $value) {
echo $value . " ";
}
echo "\n";
} else {
echo "No children\n";
}
}
?>`

The above example will output something similar to:

    No children
    Children: test4 test5

### See Also

- preg_match() - Perform a regular expression match
- preg_match_all() - Perform a global regular expression match
- preg_replace() - Perform a regular expression search and replace
- preg_split() - Split string by a regular expression

RecursiveRegexIterator
RecursiveRegexIterator::getChildren
RecursiveRegexIterator
PHP Manual