Case insensitive regular expression match

eregi_replace
split
POSIX Regex Functions
PHP Manual

# eregi

(PHP 4, PHP 5)

eregi — Case insensitive regular expression match

### Description

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

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

Warning

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

### Parameters

`pattern`

  Case insensitive regular expression.

`string`

  The input string.

`regs`

  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.

### Examples

Example #1 eregi() example

`<?php
$string = 'XYZ';
if (eregi('z', $string)) {
echo "'$string' contains a 'z' or 'Z'!";
}
?>`

### Notes

> Note:

> 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.

Tip

eregi() is deprecated as of PHP 5.3.0. preg_match() with the i (`PCRE_CASELESS`) modifier is the suggested alternative.

### 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
- quotemeta() - Quote meta characters

eregi_replace
split
POSIX Regex Functions
PHP Manual