# MongoRegex::__construct

(PECL mongo >= 0.8.1)

MongoRegex::__construct — Creates a new regular expression

> This extension that defines this method is deprecated. Instead, the MongoDB extension should be used. Alternatives to this method include:

> - MongoDB\BSON\Regex::__construct()

### Description

public MongoRegex::__construct ( string `$regex` )

Creates a new regular expression.

### Parameters

`regex`

  Regular expression string of the form `/expr/flags`.

### Return Values

Returns a new regular expression.

### Examples

Example #1 MongoRegex::__construct() example

This example uses a regular expression to query for all documents with a username field starting (`^`) with an `l` and a vowel (`[aeiouy]`), case-insensitive (`/i`).

`<?php
$luke_search = new MongoRegex("/^l[aeiouy]/i");
$cursor = $collection->find(array("username" => $luke_search));
?>`

### See Also

- MongoRegex::__toString() - A string representation of this regular expression