EREGI(3) 1 EREGI(3)eregi - Case insensitive regular expression matchSYNOPSIS
int eregi (string $pattern, string $string, [array &$regs])
DESCRIPTION
This function is identical to ereg(3) 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
o $pattern
- Case insensitive regular expression.
o $string
- The input string.
o $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(3) 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(3) is deprecated as of PHP 5.3.0. preg_match(3) with the i ( PCRE_CASELESS) modifier is the suggested alternative.
SEE ALSO ereg(3), ereg_replace(3), eregi_replace(3), preg_match(3), stripos(3), stristr(3), quotemeta(3).
PHP Documentation Group EREGI(3)
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PREG_MATCH(3) 1 PREG_MATCH(3)preg_match - Perform a regular expression matchSYNOPSIS
int preg_match (string $pattern, string $subject, [array &$matches], [int $flags], [int $offset])
DESCRIPTION
Searches $subject for a match to the regular expression given in $pattern.
PARAMETERS
o $pattern
- The pattern to search for, as a string.
o $subject
- The input string.
o $matches
- If $matches is provided, then it is filled with the results of search. $matches[0] will contain the text that matched the full
pattern, $matches[1] will have the text that matched the first captured parenthesized subpattern, and so on.
o $flags
-$flags can be the following flag:
o PREG_OFFSET_CAPTURE - If this flag is passed, for every occurring match the appendant string offset will also be returned.
Note that this changes the value of $matches into an array where every element is an array consisting of the matched string
at offset 0 and its string offset into $subject at offset 1.
o $offset
- Normally, the search starts from the beginning of the subject string. The optional parameter $offset can be used to specify the
alternate place from which to start the search (in bytes).
Note
Using $offset is not equivalent to passing substr($subject, $offset) to preg_match(3) in place of the subject string,
because $pattern can contain assertions such as ^, $ or (?<=x). Compare:
<?php
$subject = "abcdef";
$pattern = '/^def/';
preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE, 3);
print_r($matches);
?>
The above example will output:
Array
(
)
while this example
<?php
$subject = "abcdef";
$pattern = '/^def/';
preg_match($pattern, substr($subject,3), $matches, PREG_OFFSET_CAPTURE);
print_r($matches);
?>
will produce
Array
(
[0] => Array
(
[0] => def
[1] => 0
)
)
RETURN VALUES preg_match(3) returns 1 if the $pattern matches given $subject, 0 if it does not, or FALSE if an error occurred.
Warning
This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
Booleans for more information. Use the === operator for testing the return value of this function.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.6 | |
| | |
| | Returns FALSE if $offset is higher than $subject |
| | length. |
| | |
| 5.2.2 | |
| | |
| | Named subpatterns now accept the syntax |
| | (?<name>) and (?'name') as well as (?P<name>). |
| | Previous versions accepted only (?P<name>). |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
Find the string of text "php"
<?php
// The "i" after the pattern delimiter indicates a case-insensitive search
if (preg_match("/php/i", "PHP is the web scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}
?>
Example #2
Find the word "web"
<?php
/* The in the pattern indicates a word boundary, so only the distinct
* word "web" is matched, and not a word partial like "webbing" or "cobweb" */
if (preg_match("/web/i", "PHP is the web scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}
if (preg_match("/web/i", "PHP is the website scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}
?>
Example #3
Getting the domain name out of a URL
<?php
// get host name from URL
preg_match('@^(?:http://)?([^/]+)@i',
"http://www.php.net/index.html", $matches);
$host = $matches[1];
// get last two segments of host name
preg_match('/[^.]+.[^.]+$/', $host, $matches);
echo "domain name is: {$matches[0]}
";
?>
The above example will output:
domain name is: php.net
Example #4
Using named subpattern
<?php
$str = 'foobar: 2008';
preg_match('/(?P<name>w+): (?P<digit>d+)/', $str, $matches);
/* This also works in PHP 5.2.2 (PCRE 7.0) and later, however
* the above form is recommended for backwards compatibility */
// preg_match('/(?<name>w+): (?<digit>d+)/', $str, $matches);
print_r($matches);
?>
The above example will output:
Array
(
[0] => foobar: 2008
[name] => foobar
[1] => foobar
[digit] => 2008
[2] => 2008
)
NOTES
Tip
Do not use preg_match(3) if you only want to check if one string is contained in another string. Use strpos(3) or strstr(3) instead
as they will be faster.
SEE ALSO
PCRE Patterns, preg_quote(3), preg_match_all(3), preg_replace(3), preg_split(3), preg_last_error(3).
PHP Documentation Group PREG_MATCH(3)