IMPRESS dotted_line CONTACT dotted_line search dotted_line Kontakt dotted_line sitemap dotted_line print
152 PHP-Resource users online

Switch to another languags Deutsch aktuelle Sprache Englisch

PHP Manual


(PHP 4, PHP 5)

ereg_replaceReplace regular expression


string ereg_replace ( string $pattern , string $replacement , string $string )

This function scans string for matches to pattern, then replaces the matched text with replacement.


This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged.



A POSIX extended regular expression.


If pattern contains parenthesized substrings, replacement may contain substrings of the form \digit, which will be replaced by the text matching the digit'th parenthesized substring; \0 will produce the entire contents of string. Up to nine substrings may be used. Parentheses may be nested, in which case they are counted by the opening parenthesis.


The input string.

Return Values

The modified string is returned. If no matches are found in string, then it will be returned unchanged.


For example, the following code snippet prints "This was a test" three times:

Example #1 ereg_replace() example


"This is a test";
str_replace(" is"" was"$string);
ereg_replace("( )is""\\1was"$string);
ereg_replace("(( )is)""\\2was"$string);


One thing to take note of is that if you use an integer value as the replacement parameter, you may not get the results you expect. This is because ereg_replace() will interpret the number as the ordinal value of a character, and apply that. For instance:

Example #2 ereg_replace() example

/* This will not work as expected. */
$num 4;
$string "This string has four words.";
$string ereg_replace('four'$num$string);
$string;   /* Output: 'This string has   words.' */

/* This will work. */
$num '4';
$string "This string has four words.";
$string ereg_replace('four'$num$string);
$string;   /* Output: 'This string has 4 words.' */

Example #3 Replace URLs with links

'<a href="\\0">\\0</a>'$text);



As of PHP 5.3.0, the regex extension is deprecated in favor of the PCRE extension. Calling this function will issue an E_DEPRECATED notice. See the list of differences for help on converting to PCRE.


preg_replace(), which uses a Perl-compatible regular expression syntax, is often a faster alternative to ereg_replace().

See Also

  • ereg() - Regular expression match
  • eregi() - Case insensitive regular expression match
  • eregi_replace() - Replace regular expression case insensitive
  • str_replace() - Replace all occurrences of the search string with the replacement string
  • preg_replace() - Perform a regular expression search and replace

Comments to the PHP manual
Write new comment


New Tutorial entries

Migration einer PHP 5 App auf PHP 7

Dieses PHP 7 Tutorial zeigt dir, wie du dein PHP5 Script auf PHP7 umstellst.

Berni | Category: PHP
PHP 7 Virtual Machine

Dieser Artikel zielt darauf ab, einen Überblick über die Zend Virtual Machine, wie es in PHP 7 gefunden wird.

Berni | Category: PHP
plotting masters - a professional guide - Teil II

Grafische Interpolation und Bestapproximation von numerischen Wertepaaren: Wir wollen Punkte auf einer Zeichenebene über verschiedene Verfahren miteinander verbinden.

EVAMasters | Category: PHP