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><H1
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>ereg</H1
><DIV
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><A
NAME="AEN82020"
></A
><P
>    (PHP 3, PHP 4 )</P
>ereg&nbsp;--&nbsp;Regular expression match</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN82023"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>ereg</B
> ( string pattern, string string [, array regs])<BR
></BR
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      <A
HREF="function.preg-match.html"
><B
CLASS="function"
>preg_match()</B
></A
>, which uses a Perl-compatible 
      regular expression syntax, is often a faster alternative to
      <B
CLASS="function"
>ereg()</B
>.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     Searches a <TT
CLASS="parameter"
><I
>string</I
></TT
> for matches to the regular
     expression given in <TT
CLASS="parameter"
><I
>pattern</I
></TT
>.
    </P
><P
>&#13;     If matches are found for parenthesized substrings of
     <TT
CLASS="parameter"
><I
>pattern</I
></TT
> and the function is called with
     the third argument <TT
CLASS="parameter"
><I
>regs</I
></TT
>, the matches will
     be stored in the elements of the array
     <TT
CLASS="parameter"
><I
>regs</I
></TT
>. $regs[1] will contain the substring
     which starts at the first left parenthesis; $regs[2] will contain
     the substring starting at the second, and so on. $regs[0] will
     contain a copy of the complete string matched.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
     Up to (and including) PHP 4.1.0 <TT
CLASS="literal"
>$regs</TT
> will be
     filled with exactly ten elements, even though more or fewer than
     ten parenthesized substrings may actually have matched. This has
     no effect on <B
CLASS="function"
>ereg()</B
>'s ability to match more
     substrings. If no matches are found, <TT
CLASS="literal"
>$regs</TT
>
     will not be altered by <B
CLASS="function"
>ereg()</B
>. 
    </P
></BLOCKQUOTE
></DIV
><P
>&#13;     Searching is case sensitive.
    </P
><P
>&#13;     Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if a match for <TT
CLASS="parameter"
><I
>pattern</I
></TT
> was
     found in <TT
CLASS="parameter"
><I
>string</I
></TT
>, or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if no matches
     were found or an error occurred.
    </P
><P
>&#13;     The following code snippet takes a date in ISO format
     (YYYY-MM-DD) and prints it in DD.MM.YYYY format:
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><DIV
CLASS="example"
><A
NAME="AEN82061"
></A
><P
><B
>Example 1. <B
CLASS="function"
>ereg()</B
> Example</B
></P
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><PRE
CLASS="php"
>if (ereg ("([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})", $date, $regs)) {
    echo "$regs[3].$regs[2].$regs[1]";
} else {
    echo "Invalid date format: $date";
}</PRE
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>
    </P
><P
>&#13;     See also <A
HREF="function.eregi.html"
><B
CLASS="function"
>eregi()</B
></A
>,
     <A
HREF="function.ereg-replace.html"
><B
CLASS="function"
>ereg_replace()</B
></A
>,
     <A
HREF="function.eregi-replace.html"
><B
CLASS="function"
>eregi_replace()</B
></A
>, and
     <A
HREF="function.preg-match.html"
><B
CLASS="function"
>preg_match()</B
></A
>.
    </P
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