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Regular expressions are a powerful way of analyzing and retrieving values from text strings .

The regular expressions basic syntax

To use regular expressions first you need to learn the syntax of the patterns. We can group the characters inside a pattern like this:

1 Start and end indicators as ^ and $
2 Count indicators like +,*,?
3 Logical operator like |
4 Grouping with {},(),[]
5 \ is used as a general escape character

A basic example would looks like this:

<?php
if (preg_match('/tutorial/', 'tips and tutorials are very useful')) {

• php
• regex

To check your upload_max_filesize setting, create a php file called info.php in your web root directory with the following code in it

phpinfo();

and view it in a browser.Check your current upload limit .
To make changes to the upload limit you will have to edit the php.ini file .
For Fedora users it is present at /etc/php.ini .

Open the php.ini and check for
upload_max_filesize 32M

You can change it whatever file size you wan to upload .
Once the changes have been done restart apache .

• Linux
• php