Code Examples -> ereg_replace -- Replace regular expression

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PHP Code Examples

Title :	ereg_replace -- Replace regular expression
Categories :	PHP, PHP Functions, Regexps	documentation group PHP
Date :	Apr 24th 1999
Grade :	Be the 1st to grade this Code Example
Viewed :	4004
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by documentation group PHP
Action :	Grade This Code Example
Tools :	My Examples List

Code

Description

</H2
><DIV
CLASS="funcsynopsis"
><A
NAME="AEN37197"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>string <B
CLASS="function"
>ereg_replace</B
></CODE
> (string pattern, string replacement, string string)</CODE
></P
><P
></P
></DIV
><P
> This function scans <TT
CLASS="parameter"
><I
>string</I
></TT
> for matches to
<TT
CLASS="parameter"
><I
>pattern</I
></TT
>, then replaces the matched text
with <TT
CLASS="parameter"
><I
>replacement</I
></TT
>.
</P
><P
> The modified string is returned. (Which may mean that the
original string is returned if there are no matches to be
replaced.)
</P
><P
> If <TT
CLASS="parameter"
><I
>pattern</I
></TT
> contains parenthesized
substrings, <TT
CLASS="parameter"
><I
>replacement</I
></TT
> may contain
substrings of the form
<TT
CLASS="literal"
>\\<TT
CLASS="replaceable"
><I
>digit</I
></TT
></TT
>, which will
be replaced by the text matching the digit'th parenthesized
substring; <TT
CLASS="literal"
>\\0</TT
> 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.
</P
><P
> If no matches are found in <TT
CLASS="parameter"
><I
>string</I
></TT
>, then
<TT
CLASS="parameter"
><I
>string</I
></TT
> will be returned unchanged.
</P
><P
> For example, the following code snippet prints "This was a test"
three times:
<TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN37222"
></A
><P
><B
>Example 1. <B
CLASS="function"
>Ereg_replace()</B
> Example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>$string = "This is a test";
echo ereg_replace (" is", " was", $string);
echo ereg_replace ("( )is", "\\1was", $string);
echo ereg_replace ("(( )is)", "\\2was", $string);
</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
><P
> One thing to take note of is that if you use an integer value as
the <TT
CLASS="parameter"
><I
>replacement</I
></TT
> parameter, you may not get
the results you expect. This is because
<B
CLASS="function"
>ereg_replace()</B
> will interpret the number as
the ordinal value of a character, and apply that. For instance:
<TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN37229"
></A
><P
><B
>Example 2. <B
CLASS="function"
>ereg_replace()</B
> Example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
><
/* This will not work as expected. */
$num = 4;
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string; /* Output: 'This string has words.' */

/* This will work. */
$num = '4';
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string; /* Output: 'This string has 4 words.' */
?>
</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
><P
>

See also <A
HREF="get_example.php3?Function=ereg"
><B
CLASS="function"
>ereg()</B
></A
>, <A
HREF="get_example.php3?Function=eregi"
><B
CLASS="function"
>eregi()</B
></A
>,
and <A
HREF="get_example.php3?Function=eregi-replace"
><B
CLASS="function"
>eregi_replace()</B
></A
>.

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