PHP syntax

Looks like a REGEX pattern.  Please tell us what you're trying to find and give us an example of the inputs and the outputs you want.  I am sure we can help. ~Ray

The line is pattern of PHP regular expression:
http://www.regular-expressions.info/php.html
http://php.net/manual/en/function.preg-match.php

yes and im trying to understand what this regular expression mean. right now I need to look at the results from the script that somebody else wrote so i need to understand what does he meant by this regular expression.
if you can tell me how to begin to read it,
Thank you!

Afterthought... You will find examples of regular expressions like that one all over the WWW, and many of them are wrong in one way or another.  When you start writing your own regular expressions, do it as shown in this code snippet, with separate lines for separate parts and with comments to document the intent of each part of the REGEX.  This is a REGEX for validating an email address, something that does not have to be done via REGEX any more, now that we have the PHP function filter_var().
http://php.net/manual/en/function.filter-var.php

$regex
= '/'                       // START REGEX DELIMITER
. '^'                       // START STRING
. '[A-Z0-9_-]'              // AN EMAIL - SOME CHARACTER(S)
. '[A-Z0-9._-]*'            // AN EMAIL - SOME CHARACTER(S) PERMITS DOT
. '@'                       // A SINGLE AT-SIGN
. '([A-Z0-9][A-Z0-9-]*\.)+' // A DOMAIN NAME PERMITS DOT, ENDS DOT
. '[A-Z\.]'                 // A TOP-LEVEL DOMAIN PERMITS DOT
. '{2,6}'                   // TLD LENGTH >= 2 AND =< 6
. '$'                       // ENDOF STRING
. '/'                       // ENDOF REGEX DELIMITER
. 'i'                       // CASE INSENSITIVE
;
if (!preg_match($regex, $email)) return FALSE;

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ok thank you ray, there is anyway that you can five me a regex for finding URL?

Here are useful resources:
http://www.phpf1.com/tutorial/php-regular-expression.html
http://www.tipsntutorials.com/tutorials/PHP/50
http://weblogtoolscollection.com/regex/regex.php/

Ok i just want to make sure i understand it right does $urlregex is pattern for the regular url as in http:www.domain.com ?  and does it also allows to find URL as name1-name2 pattern? (with -)

Thank you!

Yes, in the example you have seen, $urlregex is the REGEX pattern.

If you are beginner to PHP, I don't recommend you to start with REGEX, since it's more complicated than the other methods in PHP.

so what is my other options to find a URL in a content not with REGEX?