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>Regular Expression Functions (POSIX Extended)</TITLE
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><H1
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>XC. Regular Expression Functions (POSIX Extended)</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN81899"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.intro"
></A
>Introduction</H1
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      PHP also supports regular expressions using a Perl-compatible syntax
      using the <A
HREF="ref.pcre.html"
>PCRE functions</A
>. Those functions
      support non-greedy matching, assertions, conditional subpatterns, and a
      number of other features not supported by the POSIX-extended regular
      expression syntax.
     </P
></BLOCKQUOTE
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><TD
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><B
>Warning</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>&#13;      These regular expression functions are not binary-safe. The <A
HREF="ref.pcre.html"
>PCRE functions</A
> are.
     </P
></TD
></TR
></TABLE
></DIV
><P
>&#13;     Regular expressions are used for complex string manipulation in
     PHP. The functions that support regular expressions are:
     <P
></P
><UL
><LI
><P
><A
HREF="function.ereg.html"
><B
CLASS="function"
>ereg()</B
></A
></P
></LI
><LI
><P
><A
HREF="function.ereg-replace.html"
><B
CLASS="function"
>ereg_replace()</B
></A
></P
></LI
><LI
><P
><A
HREF="function.eregi.html"
><B
CLASS="function"
>eregi()</B
></A
></P
></LI
><LI
><P
><A
HREF="function.eregi-replace.html"
><B
CLASS="function"
>eregi_replace()</B
></A
></P
></LI
><LI
><P
><A
HREF="function.split.html"
><B
CLASS="function"
>split()</B
></A
></P
></LI
><LI
><P
><A
HREF="function.spliti.html"
><B
CLASS="function"
>spliti()</B
></A
></P
></LI
></UL
>
     These functions all take a regular expression string as their
     first argument. PHP uses the POSIX extended regular expressions
     as defined by POSIX 1003.2. For a full description of POSIX
     regular expressions see the regex man pages included in the regex
     directory in the PHP distribution. It's in manpage format, so
     you'll want to do something along the lines of <B
CLASS="command"
>man
     /usr/local/src/regex/regex.7</B
> in order to read it.
    </P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.requirements"
></A
>Requirements</H1
><P
>No external libraries are needed to build this extension.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.installation"
></A
>Installation</H1
><P
>&#13;  To enable regexp support configure PHP
  <TT
CLASS="option"
>--with-regex[=TYPE]</TT
>. TYPE can be one of
  system, apache, php. The default is to use php.
 </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
   Do not change the TYPE unless you know what you are doing.
  </P
></BLOCKQUOTE
></DIV
><P
> The windows version of <TT
CLASS="literal"
>PHP</TT
>
has built in support for this extension. You do not need to load any additional
extension in order to use these functions.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.configuration"
></A
>Runtime Configuration</H1
><P
>This extension has no configuration directives defined in <TT
CLASS="filename"
>php.ini</TT
>.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.resources"
></A
>Resource Types</H1
><P
>This extension has no resource types defined.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.constants"
></A
>Predefined Constants</H1
><P
>This extension has no constants defined.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.examples"
></A
>Examples</H1
><P
>&#13;     <TABLE
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><TR
><TD
><DIV
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><A
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></A
><P
><B
>Example 1. Regular Expression Examples</B
></P
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><PRE
CLASS="php"
>ereg ("abc", $string);            
/* Returns true if"abc"
   is found anywhere in $string. */

ereg ("^abc", $string);
/* Returns true if "abc";
   is found at the beginning of $string. */

ereg ("abc$", $string);
/* Returns true if "abc"
   is found at the end of $string. */

eregi ("(ozilla.[23]|MSIE.3)", $HTTP_USER_AGENT);  
/* Returns true if client browser
   is Netscape 2, 3 or MSIE 3. */

ereg ("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string,$regs); 
/* Places three space separated words
   into $regs[1], $regs[2] and $regs[3]. */

$string = ereg_replace ("^", "&#60;br /&#62;", $string); 
/* Put a &#60;br /&#62; tag at the beginning of $string. */
 
$string = ereg_replace ("$", "&#60;br /&#62;", $string); 
/* Put a &#60;br /&#62;; tag at the end of $string. */

$string = ereg_replace ("\n", "", $string);
/* Get rid of any newline
   characters in $string. */</PRE
></TD
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></TD
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>
    </P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="regex.seealso"
></A
>See Also</H1
><P
>&#13;     For regular expressions in Perl-compatible syntax have a look at the
     <A
HREF="ref.pcre.html"
>PCRE functions</A
>. The simpler shell style
     wildcard pattern matching is provided by <A
HREF="function.fnmatch.html"
><B
CLASS="function"
>fnmatch()</B
></A
>.
    </P
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="function.ereg-replace.html"
>ereg_replace</A
>&nbsp;--&nbsp;Replace regular expression</DT
><DT
><A
HREF="function.ereg.html"
>ereg</A
>&nbsp;--&nbsp;Regular expression match</DT
><DT
><A
HREF="function.eregi-replace.html"
>eregi_replace</A
>&nbsp;--&nbsp;replace regular expression case insensitive</DT
><DT
><A
HREF="function.eregi.html"
>eregi</A
>&nbsp;--&nbsp;case insensitive regular expression match</DT
><DT
><A
HREF="function.split.html"
>split</A
>&nbsp;--&nbsp;split string into array by regular expression</DT
><DT
><A
HREF="function.spliti.html"
>spliti</A
>&nbsp;--&nbsp;
     Split string into array by regular expression case insensitive
    </DT
><DT
><A
HREF="function.sql-regcase.html"
>sql_regcase</A
>&nbsp;--&nbsp;
     Make regular expression for case insensitive match
    </DT
></DL
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