preg_match is a wonder ful function of PHP( 4,5,6) to Perform a regular expression match. Its little bit difficult to learn but extremely useful when you properly understand it. Extensively use to extract string in SEO process, in validation of E-mail ID and so its impossible for me to describe its utilization in PHP Development.
Structure :
preg_match
( string $pattern
, string $subject
[, array &$matches
[, int $flags = 0
[, int $offset = 0
]]] )
( string $pattern
, string $subject
[, array &$matches
[, int $flags = 0
[, int $offset = 0
]]] )
Simplified Version
preg_match(pattern, Subject ,array)
Pattern- The pattern to search for, as a string.
like
+91-8564123356
<title>openplus.in</title>
Subject = Variable that contains that value
like
$sanjay=’[email protected]’;
Array- to store extracted value.
For more details visit PHP.net
A Simple Example:
This example extract title from title tags, heavily used is SEO industry.
<?php
$sanjay='<title>Please share this page to twitter, Google Plus and Twitter</title>’;
preg_match(‘/<title>(.*)</title>/i’,$sanjay,$mt);
echo $mt[‘1’];
?>
$sanjay='<title>Please share this page to twitter, Google Plus and Twitter</title>’;
preg_match(‘/<title>(.*)</title>/i’,$sanjay,$mt);
echo $mt[‘1’];
?>
Note : use / to start a pattern and /i to end. Use (.*) to find the desired value.
Above Code will give a out put
Please share this page to twitter, Google Plus and Twitter
Please share this page to twitter, Google Plus and Twitter
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Another similar Example of Preg_match with regular expression to validate e-mail id is here
Validate E-mail id using preg_match and regular expression
Here is how to scrape with pregmatch.
http://www.bohemiawebsites.com/Scrape-HTML-With-PHP.html
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