(PHP 4, PHP 5)

eregiCase insensitive regular expression match


int eregi ( string $pattern , string $string [, array &$regs ] )

This function is identical to ereg() except that it ignores case distinction when matching alphabetic characters.


This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged.



Case insensitive regular expression.


The input string.


If matches are found for parenthesized substrings of pattern and the function is called with the third argument regs, the matches will be stored in the elements of the array regs.

$regs[1] will contain the substring which starts at the first left parenthesis; $regs[2] will contain the substring starting at the second, and so on. $regs[0] will contain a copy of the complete string matched.

Return Values

Returns the length of the matched string if a match for pattern was found in string, or FALSE if no matches were found or an error occurred.

If the optional parameter regs was not passed or the length of the matched string is 0, this function returns 1.


Example #1 eregi() example

if (
eregi('z'$string)) {
"'$string' contains a 'z' or 'Z'!";



As of PHP 5.3.0, the regex extension is deprecated in favor of the PCRE extension. Calling this function will issue an E_DEPRECATED notice. See the list of differences for help on converting to PCRE.

See Also

  • ereg() - Regular expression match
  • ereg_replace() - Replace regular expression
  • eregi_replace() - Replace regular expression case insensitive
  • preg_match() - Perform a regular expression match
  • stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
  • stristr() - Case-insensitive strstr