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preg_quote

(PHP 4, PHP 5, PHP 7, PHP 8)

preg_quote — Quote regular expression characters

Опис

preg_quote(string $str, ?string $delimiter = null): string

preg_quote() takes str and puts a backslash in front of every character that is part of the regular expression syntax. This is useful if you have a run-time string that you need to match in some text and the string may contain special regex characters.

The special regular expression characters are: . \ + * ? [ ^ ] $ ( ) { } = ! < > | : - #

Note that / is not a special regular expression character.

Зауваження:

Note that preg_quote() is not meant to be applied to the $replacement string(s) of preg_replace() etc.

Параметри

str

The input string.

delimiter

If the optional delimiter is specified, it will also be escaped. This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter.

Значення, що повертаються

Returns the quoted (escaped) string.

Журнал змін

Версія Опис
7.3.0 The # character is now quoted
7.2.0 delimiter is nullable now.

Приклади

Приклад #1 preg_quote() example

<?php
$keywords = '$40 for a g3/400';
$keywords = preg_quote($keywords, '/');
echo $keywords; // returns \$40 for a g3\/400
?>

Приклад #2 Italicizing a word within some text

<?php
// In this example, preg_quote($word) is used to keep the
// asterisks from having special meaning to the regular
// expression.

$textbody = "This book is *very* difficult to find.";
$word = "*very*";
$textbody = preg_replace ("/" . preg_quote($word, '/') . "/",
"<i>" . $word . "</i>",
$textbody);
?>

Примітки

Зауваження: Ця функція є бінарно безпечною.

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