XC. Regular Expression Functions (POSIX Extended)

Wprowadzenie

Notatka: 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.

Ostrzeżenie

These regular expression functions are not binary-safe. The PCRE functions are.

Regular expressions are used for complex string manipulation in PHP. The functions that support regular expressions are:

These functions all take a regular expression string as their first argument. 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.

Wymagania

Te funkcje są częścią modułu podstawowego, dlatego są zawsze dostępne.

Instalacja

To enable regexp support configure PHP --with-regex[=TYPE]. TYPE can be one of system, apache, php. The default is to use php.

Notatka: Do not change the TYPE unless you know what you are doing.

The windows version of PHP has built in support for this extension. You do not need to load any additional extension in order to use these functions.

Konfiguracja startowa

To rozszerzenie nie definiuje żadnych dyrektyw konfiguracyjnych.

Typy zasobów

To rozszerzenie nie definiuje żadnych rodzajów zasobów.

Predefiniowane stałe

To rozszerzenie nie definiuje żadnych stałych.

Przykłady

Przykład 1. Regular Expression Examples

ereg ("abc", $string);            
/* 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. */

eregi ("(ozilla.[23]|MSIE.3)", $HTTP_USER_AGENT);  
/* Returns true if client browser
   is Netscape 2, 3 or MSIE 3. */

ereg ("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string,$regs); 
/* Places three space separated words
   into $regs[1], $regs[2] and $regs[3]. */

$string = ereg_replace ("^", "<br />", $string); 
/* 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 ("\n", "", $string);
/* Get rid of any newline
   characters in $string. */

Zobacz również

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().

Spis treści
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