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# preg_grep

(PHP 4 >= 4.0.0)

preg_grep -- Return array entries that match the pattern

## Description

``array preg_grep` (string pattern, array input)`

preg_grep() returns the array consisting of the elements of the `input` array that match the given `pattern`.

Since PHP 4.0.4, the results returned by preg_grep() are indexed using the keys from the input array. If this behavior is undesirable, use array_values() on the array returned by preg_grep() to reindex the values.

Example 1. preg_grep() example
    // return all array elements
    // containing floating point numbers
    $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);

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