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>preg_match</A
></H1
><DIV
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><A
NAME="AEN32835"
></A
><P
>    (PHP3 &#62;= 3.0.9, PHP4 )</P
>preg_match&nbsp;--&nbsp;Perform a regular expression match</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN32838"
></A
><H2
>Description</H2
><DIV
CLASS="funcsynopsis"
><A
NAME="AEN32840"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="function"
>preg_match</B
></CODE
> (string pattern, string subject [, array 
       matches])</CODE
></P
><P
></P
></DIV
><P
>&#13;     Searches <TT
CLASS="parameter"
><I
>subject</I
></TT
> for a match to the regular
     expression given in <TT
CLASS="parameter"
><I
>pattern</I
></TT
>.
    </P
><P
>&#13;     If <TT
CLASS="parameter"
><I
>matches</I
></TT
> is provided, then it is filled
     with the results of search.  $matches[0] will contain the text that
     match the full pattern, $matches[1] will have the text that matched
     the first captured parenthesized subpattern, and so on.
    </P
><P
>&#13;     Returns true if a match for <TT
CLASS="parameter"
><I
>pattern</I
></TT
> was
     found in the subject string, or false if not match was found
     or an error occurred.</P
><P
>&#13;     <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
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></A
><P
><B
>Example 1. find the string of text "php"</B
></P
><TABLE
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><TR
><TD
><PRE
CLASS="programlisting"
>&#13;// the "i" after the pattern delimiter indicates a case-insensitive search
if (preg_match ("/php/i", "PHP is the web scripting language of choice.")) {
    print "A match was found.";
} else {
    print "A match was not found.";
}
      </PRE
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>
     <TABLE
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><A
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></A
><P
><B
>Example 2. find the word "web"</B
></P
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><TD
><PRE
CLASS="programlisting"
>&#13;// the \b in the pattern indicates a word boundary, so only the distinct
// word "web" is matched, and not a word partial like "webbing" or "cobweb"
if (preg_match ("/\bweb\b/i", "PHP is the web scripting language of choice.")) {
    print "A match was found.";
} else {
    print "A match was not found.";
}
if (preg_match ("/\bweb\b/i", "PHP is the website scripting language of choice.")) {
    print "A match was found.";
} else {
    print "A match was not found.";
}
      </PRE
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>
     <TABLE
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><A
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></A
><P
><B
>Example 3. Getting the domain name out of a URL</B
></P
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><TD
><PRE
CLASS="programlisting"
>&#13;preg_match("/^(.*)([^\.]+\.[^\.]+)(\/.*)?/U",
           "http://www.php.net/index.html", $matches);
// show the second parenthesized subpattern
echo "domain name is: ".$matches[2]."\n"; 
      </PRE
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>
     This example will produce:
     <TABLE
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><TR
><TD
><PRE
CLASS="programlisting"
>&#13;domain name is: php.net
     </PRE
></TD
></TR
></TABLE
>
     See also <A
HREF="function.preg-match-all.html"
><B
CLASS="function"
>preg_match_all()</B
></A
>, 
     <A
HREF="function.preg-replace.html"
><B
CLASS="function"
>preg_replace()</B
></A
>, and
     <A
HREF="function.preg-split.html"
><B
CLASS="function"
>preg_split()</B
></A
>.
    </P
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