Instalarea

Beginning with PHP 4.2.0 these functions are enabled by default. You can disable the pcre functions with --without-pcre-regex. Use --with-pcre-regex=DIR to specify DIR where PCRE's include and library files are located, if not using bundled library. For older versions you have to configure and compile PHP with --with-pcre-regex[=DIR] in order to use these functions.

Versiunea PHP pentru Windows susţine implicit această extensie. Nu este nevoie să încărcaţi extensii suplimentare pentru a putea utiliza aceste funcţii.

Notă: As of PHP 5.3.0 this extension cannot be disabled and is therefore always present.
It is still possible to build against an external PCRE library by using --with-pcre-regex=DIR