php preg match

1<?php
2//Syntex : int preg_match( $pattern, $input, $matches, $flags, $offset)
3  
4// Declare a variable and initialize it 
5$str = "Check For Testing."; 
6  
7// case-Insensitive search for the word "Check" 
8if (preg_match("/\bCheck\b/i", $str, $match))  
9    echo "Matched!"; 
10else
11    echo "not matched";   
12  
13
14// Output : Matched
15?>

1<?php
2   $line = "Vi is the greatest word processor ever created!";
3   // perform a case-Insensitive search for the word "Vi"
4   
5   if (preg_match("/\bVi\b/i", $line, $match)) :
6      print "Match found!";
7      endif;
8?>

1if (preg_match("/\bweb\b/i", "PHP is the web scripting language of choice.")) {
2    echo "A match was found.";
3} else {
4    echo "A match was not found.";
5}

1if(!preg_match('/^\[a-zA-Z]+$/',$input)) {
2   // String contains not allowed characters ...
3}

1<?php
2$my_email = "name@company.com";
3if (preg_match("/^[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+\.[a-zA-Z.]{2,5}$/", $my_email)) {
4echo "$my_email is a valid email address";
5}
6else
7{
8  echo "$my_email is NOT a valid email address";
9}
10?>

1preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] ) : int