# preg_replace

```php  
preg\_replace('//\\W|\_/', '', '') // remove non-alphanumeric

preg\_replace("/\[^A-Za-z0-9 \]/",

preg\_replace('/\[^\\d\]/i', '', '') // remove non-numeric

preg\_replace('/\[^A-Za-z0-9\\ \\/\\-\\n\\,\]+/', '', $address); // remove non alpha + new line, space, some special char   
```