XCVI. Regular Expression Functions (POSIX Extended)

Introducere

Indicaþie: 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.

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

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.

Necesităţi

Aceste funcţii sunt disponibile ca părţi ale modulului standard care este întotdeauna disponibil.

Instalare

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

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

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.

Configurare la rulare

Această extensie nu defineşte directive de configurare.

Tipuri de resurse

Această extensie nu defineşte tipuri de resurse.

Constante predefinite

Această extensie nu defineşte constante.

Exemple

Exemplu 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);
?>

Vezi, de asemenea,

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().

Cuprins
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

XCVI. Regular Expression Functions (POSIX Extended)

Introducere

Necesităţi

Instalare

Configurare la rulare

Tipuri de resurse

Constante predefinite

Exemple

Vezi, de asemenea,

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