PHP/String/ereg

break $url down into three distinct pieces

 
<?php
   $url = "http://www.wbex.ru";
   $parts = ereg("^(http://www)\.([[:alnum:]]+)\.([[:alnum:]]+)", $url, $regs);
   echo $regs[0];     
   echo "<br>";
   echo $regs[1];     
   echo "<br>";
   echo $regs[2];     
   echo "<br>";
   echo $regs[3];     
?>

Capturing Text Inside HTML or XML Tags

 
<?php 
$text = "<p>This is some text here \"</p>\".</p>"; 
ereg("<p>(([^<\"]|[^<]*<[^\/][^<])*(\"[^\"]*\"([^<\"]|[^<]*<[^\/][^<])*)*)?<\/p>", $text, $matches); 
echo "Found text: " . $matches[1] . "\n"; 
?>

Displaying elements of $regs array

 
<?
$url = "http://www.wbex.ru";
$www_url = ereg("^(http://www)\.([[:alnum:]]+)\.([[:alnum:]]+)", $url, $regs);
if ($www_url) :         
     echo $regs[0];     
     print "<br>";
     echo $regs[1];     
     print "<br>";
     echo $regs[2];     
     print "<br>";
     echo $regs[3];     
endif;
?>

ereg() function searches a string, returning true if the pattern is found, and false otherwise.

 
Its syntax is: int ereg(string pattern, string string, [array regs])
The search is case sensitive in regard to alphabetical characters. 
Use ereg() to search strings for .ru domains:
<?
        $email="a@a.ru";
        $is_com = ereg("(\.)(com$)", $email);
        print $is_com;
?>

ereg.php

 
<?php
   $username = "Test";
   if (ereg("([^a-z])",$username)) echo "Username must be all lowercase!";
?>

Filling Patterns with ereg

 
<?php
    $s = "m@t.ca";
    if (ereg ("([[:alpha:]]+)@([[:alpha:]]+)\.([[:alpha:]]{2,4})", $s, $matches))
    {
      echo "Regular expression successful. Dumping matches\n";
      var_dump ($matches);
    }
    else
    {
      echo "Regular expression unsuccessful.\n";
    }
?>