Holes in most preg_match() filters - PHP Security Blog
During the last week I was performing some audits and like so often it contained preg_match() filters that were not correct. Most PHP developers use ^ and $ within their regular expressions without actually reading the documentation about what they really achieve. You will find a lot of input filters like the following one.<?php $clean = array(); if (preg_match("/^[0-9]+:[X-Z]+$/", $_GET['var']))
Using Regular Expressions with PHP – WebCheatSheet
Regular expressions are a powerful tool for examining and modifying text. Regular expressions themselves, with a general pattern notation almost like a mini programming language, allow you to describe and parse text. They enable you to search for patterns within a string, extracting matches flexibly and precisely. However, you should note that because regular expressions are more powerful, they ar
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How to write a simple PHP template engine - I’m Mike
