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>XLVI. Regular expression functions</H1
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>&#13;    Regular expressions are used for complex string manipulation in
    PHP. The functions that support regular expressions are:

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><B
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>ereg()</B
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>ereg_replace()</B
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><B
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>eregi()</B
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>eregi_replace()</B
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>

    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.

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>Example 1. Regular expression examples</B
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>  1&nbsp;
  2&nbsp;ereg("abc",$string);            
  3&nbsp;/* Returns true if "abc"
  4&nbsp;   is found anywhere in $string. */
  5&nbsp;
  6&nbsp;ereg("^abc",$string);
  7&nbsp;/* Returns true if "abc"
  8&nbsp;   is found at the beginning of $string. */
  9&nbsp;
 10&nbsp;ereg("abc$",$string);
 11&nbsp;/* Returns true if "abc"
 12&nbsp;   is found at the end of $string. */
 13&nbsp;
 14&nbsp;eregi("(ozilla.[23]|MSIE.3)",$HTTP_USER_AGENT);  
 15&nbsp;/* Returns true if client browser
 16&nbsp;   is Netscape 2, 3 or MSIE 3. */
 17&nbsp;
 18&nbsp;ereg("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)",
 19&nbsp;     $string,$regs); 
 20&nbsp;/* Places three space separated words
 21&nbsp;   into $regs[1], $regs[2] and $regs[3]. */
 22&nbsp;
 23&nbsp;$string = ereg_replace("^","&#60;BR&#62;",$string); 
 24&nbsp;/* Put a &#60;BR&#62; tag at the beginning of $string. */
 25&nbsp; 
 26&nbsp;$string = ereg_replace("$","&#60;BR&#62;",$string); 
 27&nbsp;/* Put a &#60;BR&#62; tag at the end of $string. */
 28&nbsp;
 29&nbsp;$string = ereg_replace("\n","",$string);
 30&nbsp;/* Get rid of any newline
 31&nbsp;   characters in $string. */
 32&nbsp;     </PRE
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><DT
><A
HREF="function.ereg.html"
>ereg</A
> &#8212; regular expression match</DT
><DT
><A
HREF="function.ereg-replace.html"
>ereg_replace</A
> &#8212; replace regular expression</DT
><DT
><A
HREF="function.eregi.html"
>eregi</A
> &#8212; case insensitive regular expression match</DT
><DT
><A
HREF="function.eregi-replace.html"
>eregi_replace</A
> &#8212; replace regular expression case insensitive</DT
><DT
><A
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>split</A
> &#8212; split string into array by regular expression</DT
><DT
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>sql_regcase</A
> &#8212; make regular expression for case insensitive match</DT
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