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# regex_replace
A regular expression search and replace on a variable. Use the
[`preg_replace()`](https://www.php.net/preg_replace) syntax from the PHP
manual.
## Basic usage
```smarty
{$myVar|regex_replace:"/foo/":"bar"}
```
> **Note**
>
> Although Smarty supplies this regex convenience modifier, it is
> usually better to apply regular expressions in PHP, either via custom
> functions or modifiers. Regular expressions are considered application
> code and are not part of presentation logic.
## Parameters
| Parameter Position | Type | Required | Description |
|--------------------|--------|----------|------------------------------------------------|
| 1 | string | Yes | This is the regular expression to be replaced. |
| 2 | string | Yes | This is the string of text to replace with. |
## Examples
```php
<?php
$smarty->assign('articleTitle', "Infertility unlikely to\nbe passed on, experts say.");
```
Where template is:
```smarty
{* replace each carriage return, tab and new line with a space *}
{$articleTitle}
{$articleTitle|regex_replace:"/[\r\t\n]/":" "}
```
Will output:
```
Infertility unlikely to
be passed on, experts say.
Infertility unlikely to be passed on, experts say.
```
See also [`replace`](language-modifier-replace.md) and
[`escape`](language-modifier-escape.md).
|
