- preg_replace: documentation ( source)
<?php
$string=<<<eos
Language, Talysh Language, and Balochi language.
The language is in the List of Southwestern Iranian languages group, along with the Larestani dialects, Kumzari language and Luri language languages.
==Etymology==
===Persian language name in Persian===
Persian is known by other names by native speakers:
Western Persian ( ) Or , or Parsi () has been the native name of the Persian by all its speakers until 20th century.
eos;
echo preg_replace('#\n#u','xxxx',$string);