preg_grep
(PHP 4, PHP 5)
preg_grep — Return array entries that match the pattern
Description
$pattern
, array $input
[, int $flags = 0
] )
Returns the array consisting of the elements of the
input array that match the given
pattern.
Parameters
-
pattern -
The pattern to search for, as a string.
-
input -
The input array.
-
flags -
If set to
PREG_GREP_INVERT, this function returns the elements of the input array that do not match the givenpattern.
Return Values
Returns an array indexed using the keys from the
input array.
Changelog
| Version | Description |
|---|---|
| 4.2.0 |
The flags parameter was added.
|
| 4.0.4 |
Prior to this version, the returned array was indexed regardless of
the keys of the If you want to reproduce this old behavior, use array_values() on the returned array to reindex the values. |
Examples
Example #1 preg_grep() example
<?php
// return all array elements
// containing floating point numbers
$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);
?>
See Also
- PCRE Patterns
- preg_match_all() - Perform a global regular expression match
- preg_filter() - Perform a regular expression search and replace
- preg_last_error() - Returns the error code of the last PCRE regex execution
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