PHP mb_eregi() Function

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The mb_eregi() function is an inbuilt function in PHP that performs case-insensitive regular expression matches on a string having multibyte support. If the string pattern is matched, then it will return the string otherwise it will return false.

Syntax:

mb_eregi(
    string $pattern, 
    string $string, 
    array &$matches = null
): bool

Parameters: The following function has three parameters that are described below.

$pattern: The regular expression pattern that we used for matching against the multibyte string.
$string: This is the string where we search our pattern.
$matches: This is the parameter that stores the matched substrings which starts from the left parentheses from the $string input. $matches[1] will have the matched substring which starts at the first left parentheses and $matches[2] will have the matched substring which starts at the second left parentheses and so on.

Return Values: The mb_eregi() function returns a boolean value after executing the case insensitive regular expression. If the function found the pattern in the given string, it will return “true”, otherwise it will return “false”.

Program 1: The following program demonstrates the mb_eregi() function.

PHP

<?php 
  
$string = "Hello, World!"; 
$pattern = "world"; 
  
// Set the multibyte encoding 
mb_regex_encoding("UTF-8"); 
  
if (mb_eregi($pattern, $string)) { 
    echo "Pattern found!"; 
} else { 
    echo "Pattern not found."; 
} 
  
?>

Output

Pattern found!

Program 2: The following program demonstrates the mb_eregi() function.

PHP

<?php 
  
$subject = "VDwS0ErZ5K"; 
  
if (mb_eregi("^[A-Za-z\s]+$", $subject)) { 
    echo "Match found!"; 
} else { 
    echo "Match not found!"; 
} 
  
?>