Padrões PCRE
Differences From Perl
Padrões PCRE
PHP Manual

# Pattern Syntax

## Índice

- Differences From Perl
- Regular Expression Details

## Description

The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5, with just a few differences (see below). The current implementation corresponds to Perl 5.005.

Padrões PCRE
Differences From Perl
Padrões PCRE
PHP Manual