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CXIV. Regular Expression Functions (POSIX Extended)Подсказка:
PHP also supports regular expressions using a Perl-compatible syntax
using the PCRE functions. Those functions
support non-greedy matching, assertions, conditional subpatterns, and a
number of other features not supported by the POSIX-extended regular
expression syntax.
Внимание |
These regular expression functions are not binary-safe. The PCRE functions are.
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Regular expressions are used for complex string manipulation.
PHP uses the POSIX extended regular expressions as defined by POSIX
1003.2. For a full description of POSIX regular expressions see the regex
man pages included in the regex directory in the PHP distribution. It's
in manpage format, so you'll want to do something along the lines of
man /usr/local/src/regex/regex.7 in order to read it.
Эти функции всегда доступны. Внимание |
Do not change the TYPE unless you know what you are doing.
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To enable regexp support configure PHP
--with-regex[=TYPE]. TYPE can be one of
system, apache, php. The default is to use php.
Версия PHP для
Windows имеет встроенную поддержку данного расширения. Это означает, что
для использования данных функций не требуется загрузка никаких
дополнительных расширений. Данное расширение не определяет никакие директивы конфигурации в php.ini. Данное расширение не определяет никакие типы ресурсов. Данное расширение не определяет никакие константы.
Пример 1. Regular Expression Examples
<?php // Returns true if "abc" is found anywhere in $string. ereg("abc", $string);
// Returns true if "abc" is found at the beginning of $string. ereg("^abc", $string);
// Returns true if "abc" is found at the end of $string. ereg("abc$", $string);
// Returns true if client browser is Netscape 2, 3 or MSIE 3. eregi("(ozilla.[23]|MSIE.3)", $HTTP_USER_AGENT);
// Places three space separated words into $regs[1], $regs[2] and $regs[3]. ereg("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string, $regs);
// Put a <br /> tag at the beginning of $string. $string = ereg_replace("^", "<br />", $string); // Put a <br /> tag at the end of $string. $string = ereg_replace("$", "<br />", $string);
// Get rid of any newline characters in $string. $string = ereg_replace("\n", "", $string); ?>
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For regular expressions in Perl-compatible syntax have a look at the
PCRE functions. The simpler shell style
wildcard pattern matching is provided by fnmatch().
- Содержание
- ereg_replace -- Replace regular expression
- ereg -- Regular expression match
- eregi_replace -- Replace regular expression case insensitive
- eregi -- Case insensitive regular expression match
- split -- Split string into array by regular expression
- spliti --
Split string into array by regular expression case insensitive
- sql_regcase --
Make regular expression for case insensitive match
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