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@ 2017-06-28T19:39:49Z

<?php
$str = 'fd.com..ec'; 
$pattern = '/^[A-Z0-9.-]+\.[A-Z]{2,}\b/i';
var_dump(preg_match($pattern, $str));
/*function validaEmailUsername($str){
		$allowed = array("-", ".", "_"); // you can add here more value, you want to allow.		
		$regExp = implode($allowed);
		$str = trim($str);
		//valido inicio y fin del username no tenga .-_
		if( (preg_match('/^['.$regExp.']|['.$regExp.']$/i', $str) == 0) && (strlen($str) > 5) ) { 
			$count_special_char = preg_match_all("/[".$regExp."]/i", $str, $matches);
			if( ctype_alnum(str_replace($allowed, '', $str )) && ($count_special_char == 0 || $count_special_char == 1) ){
				$badWords = array("usuario","user","test","demo","notiene", "prueba", ".com", ".net");
				$matches = array();
				$matchFound = preg_match_all("/\b(" . implode($badWords,"|") . ")\b/i", $str, $matches);

				if ($matchFound){
					return false;
				}
				return true;
			}			
		} 
		return false;
	}*/

Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/1W12b
function name:  (null)
number of ops:  10
compiled vars:  !0 = $str, !1 = $pattern
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'fd.com..ec'
    3     1        ASSIGN                                                   !1, '%2F%5E%5BA-Z0-9.-%5D%2B%5C.%5BA-Z%5D%7B2%2C%7D%5Cb%2Fi'
    4     2        INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'preg_match'
          4        SEND_VAR                                                 !1
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $4      
          7        SEND_VAR                                                 $4
          8        DO_ICALL                                                 
   24     9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0

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161.95 ms | 1393 KiB | 17 Q