In this tutorial I will show you the basic in regex.

In brief discussion.

Regex is considered a method of matching pattern within a string. In PHP usually used PCRE or "Perl Compatible Regular Expressions".

Let's see a sample to print a string.

1. <?php
   
2. 
   
3. // create a string
   
4. $string
   
   =
   
   'abcdefghijklmnopqrstuvwxyz0123456789'
   
   ;
   
5. // echo our string
   
6. echo
   
   $string
   
   ;
   
7. 
   
8. ?>
   

The above code are printing "abcdefghijklmnopqrstuvwxyz0123456789". Now were going to match the character "xyz" using regex.

1. <?php
   
2. 
   
3. // create a string
   
4. $string
   
   =
   
   'abcdefghijklmnopqrstuvwxyz0123456789'
   
   ;
   
5. echo
   
   preg_match
   
   (
   
   "/xyz/"
   
   ,
   
   $string
   
   )
   
   ;
   
6. 
   
7. ?>
   

The code above will output "1" because the character "xyz" are matches to the string given. Then the preg_match will output zero "0" if it could not matches to the string given.

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