PHP Live Regex Test PHP regular expressions live in your browser and generate sample code for pregmatch, pregmatchall, pregreplace, preggrep, and pregsplit! — A Live Regular Expression Tester for PHP Tutorials and Regex Database.

1. Php Regex Tutorial
2. Php Replace Regex
3. Php Regex Cheat Sheet
4. Perl Regex Cheat Sheet

• Test PHP regular expressions live in your browser and generate sample code for pregmatch, pregmatchall, pregreplace, preggrep, and pregsplit! — A Live Regular Expression Tester for PHP. Cheat Sheet abc A single character of: a, b or c ^abc Any single character except: a, b, or c a-z.
• We wanted to create short, simple guidelines that developers could follow to prevent XSS, rather than simply telling developers to build apps that could protect against all the fancy tricks specified in rather complex attack cheat sheet, and so the OWASP Cheat Sheet Series was born. This cheat sheet lists a series of XSS attacks that can.

Regular expressions are a very useful tool for developers. They allow to find, identify or replace a word, character or any kind of string. This tutorial will teach you how to master PHP regexp and show you extremely useful, ready-to-use PHP regular expressions that any web developer should have in his toolkit.

Getting Started With Regular Expressions

For many beginners, regular expressions seem to be hard to learn and use. In fact, they’re far less hard than you may think. Before we dive deep inside regexp with useful and reusable codes, let’s quickly see the basics of PCRE regex patterns:

Regular Expressions Syntax

A regular expression (regex or regexp for short) is a special text string for describing a search pattern. A regex pattern matches a target string. Gopro codec for mac. The following table describes most common regex:

PHP Regular Expression Functions

PHP has many useful functions to work with regular expressions. Here is a quick cheat sheet of the main PHP regex functions. Remember that all of them are case sensitive.

For more information about the native functions for PHP regular expressions, have a look at the manual.

Validate a Domain Name

Case sensitive regex to verify if a string is a valid domain name. This is very useful when validating web forms.

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Enlight a Word From a Text

This very useful regular expression will find a specific word in a string and enlight it. Extremely useful for search results. Remember that it’s case sensitive.

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Enlight Search Results in Your WordPress Blog

The previous code snippet can be very handy when it comes to displaying search results. If your website is powered by WordPress, here is a more specific snippet that will search and replace a text by the same text within an HTML tag that you can style later, using CSS.

Open your search.php file and find the the_title() function. Replace it with the following:

Now, just before the modified line, add this code:

Save the search.php file and open style.css. Append the following line to it:

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Get All Images From a HTML Document

If you ever wanted to be able to get all images form a webpage, this code is a must have for you. You should easily create an image downloader using the power of cURL.

Php Regex Tutorial

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Remove Repeated Words (Case Insensitive)

Often repeating words while typing? This handy case insensitive PCRE regex will be very helpful.

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Remove Repeated Punctuation

Same php regex as above, but this one will look for repeated punctuation within a string. Goodbye multiple commas!

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Match a XML/HTML Tag

This simple function takes two arguments: The first is the tag you’d like to match, and the second is the variable containing the XML or HTML. Once again, this can be very powerful used along with cURL.

Match an HTML/XML Tag With a Specific Attribute Value

This function is very similar to the previous one, but it allow you to match a tag having a specific attribute. For example, you could easily match <div>.

Match Hexadecimal Color Values

Another interesting tool for web developers! It allows you to match/validate a hexadecimal color value.

Find Page Title

This handy code snippet will find and print the text within the <title> and </title> tags of a HTML page.

Parse Apache Logs

Most websites are running on the Apache webserver. If your website does, you can easily use PHP and regular expressions to parse Apache logs.

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Replace Double Quotes by Smart Quotes

If you’re a typography lover, you’ll probably love this regex pattern which allow you to replace double quotes by smart quotes. A similar regular expression is used by WordPress to make the content more beautiful.

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Check Password Complexity

This regular expression will tests if the input consists of 6 or more letters, digits, underscores, and hyphens.
The input must contain at least one uppercase letter, one lowercase letter and one digit.

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WordPress: Using Regexp to Retrieve Images From a Post

As I know many of you are WordPress users, you’ll probably enjoy that code which allows you to retrieve all images from post content and display it.

To use this code on your blog, simply paste the following code on one of your theme files.

Generate Emoticons Automatically

Another function used by WordPress. This one allow you to automatically replace an emoticon symbol by an image.

Table of Contents

• preg_filter — Perform a regular expression search and replace
• preg_grep — Return array entries that match the pattern
• preg_last_error_msg — Returns the error message of the last PCRE regex execution
• preg_last_error — Returns the error code of the last PCRE regex execution
• preg_match_all — Perform a global regular expression match
• preg_match — Perform a regular expression match
• preg_quote — Quote regular expression characters
• preg_replace_callback_array — Perform a regular expression search and replace using callbacks
• preg_replace_callback — Perform a regular expression search and replace using a callback
• preg_replace — Perform a regular expression search and replace
• preg_split — Split string by a regular expression

Php Replace Regex

Php Regex Cheat Sheet

Perl Regex Cheat Sheet

• PCRE