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# ereg_replace

ereg_replace -- replace regular expression

## Description

`string ereg_replace`(string pattern, string replacement, string string);

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

The modified string is returned. (Which may mean that the original string is returned if there are no matches to be replaced.)

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.

If no matches are found in `string`, then `string` will be returned unchanged.

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

Example 1. ereg_replace() example
    $string = "This is a test";
    echo ereg_replace( " is", " was", $string );
    echo ereg_replace( "( )is", "\\1was", $string );
    echo ereg_replace( "(( )is)", "\\2was", $string );

See also ereg(), eregi(), and eregi_replace().

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