The behaviour of mb_ereg_match to imply a ^ at the beginning of the pattern stands in stark contrast to the behaviour of mb_ereg where ^ is NOT implied.
Switching between those two routines (because the need to extract a subpattern changes) requires careful consideration when to compensate for this surprising inconsistence.
mb_ereg_match
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
mb_ereg_match — Regular expression match for multibyte string
Beschreibung
A regular expression match for a multibyte string
Hinweis:
patternis only matched at the beginning ofstring.
Parameter-Liste
-
pattern -
The regular expression pattern.
-
string -
The string being evaluated.
-
options -
The search option. See mb_regex_set_options() for explanation.
Rückgabewerte
Returns true if
string matches the regular expression
pattern, false if not.
Changelog
| Version | Beschreibung |
|---|---|
| 8.0.0 |
options is nullable now.
|
Anmerkungen
Hinweis:
Die interne Kodierung oder die mit mb_regex_encoding() festgelegte Zeichenkodierung wird als Zeichenkodierung für diese Funktion genutzt.
Siehe auch
- mb_regex_encoding() - Set/Get character encoding for multibyte regex
- mb_ereg() - Regular expression match with multibyte support
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User Contributed Notes 3 notes
Anonymous ¶
8 years ago
Anonymous ¶
16 years ago
Note that this function matches a string from the beginning only (though not necessarily till the end):
<?php
$test = mb_ereg_match("a", "some apples"); // returns false
$test = mb_ereg_match("a", "a kiwi"); // returns true
?>
If you want to check for a match anywhere in the string, use the wild-card & repeat operators .*
<?php
$test = mb_ereg_match(".*a", "some apples"); // returns true
?>
webdesign at innato dot nl ¶
5 years ago
It took me a while to discover that you must escape characters like parentheses (), square brackets [] and ^ (and maybe more) if you want to match these as a literal. Otherwise you may get some erratic outcome.
In summary, using a match anywhere in the string as an example:
<?php
$needle = "[";
$haystack = "some_array[]";
$test= mb_ereg_match(".*".$needle, $haystack); // returns false and a php warning
$test= mb_ereg_match('.*'.preg_quote($needle), $haystack); // returns true
?>
