<HTML ><HEAD ><TITLE >preg_grep</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Regular Expression Functions (Perl-Compatible)" HREF="ref.pcre.html"><LINK REL="PREVIOUS" TITLE="Pattern Syntax" HREF="pcre.pattern.syntax.html"><LINK REL="NEXT" TITLE="preg_match_all" HREF="function.preg-match-all.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="pcre.pattern.syntax.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.preg-match-all.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.preg-grep" ></A >preg_grep</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN81443" ></A ><P > (PHP 4 )</P >preg_grep -- Return array entries that match the pattern </DIV ><DIV CLASS="refsect1" ><A NAME="AEN81446" ></A ><H2 >Description</H2 >array <B CLASS="methodname" >preg_grep</B > ( string pattern, array input)<BR ></BR ><P > <B CLASS="function" >preg_grep()</B > returns the array consisting of the elements of the <TT CLASS="parameter" ><I >input</I ></TT > array that match the given <TT CLASS="parameter" ><I >pattern</I ></TT >. </P ><P > Since PHP 4.0.4, the results returned by <B CLASS="function" >preg_grep()</B > are indexed using the keys from the input array. If this behavior is undesirable, use <A HREF="function.array-values.html" ><B CLASS="function" >array_values()</B ></A > on the array returned by <B CLASS="function" >preg_grep()</B > to reindex the values. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN81466" ></A ><P ><B >Example 1. <B CLASS="function" >preg_grep()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="php" >// return all array elements // containing floating point numbers $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="pcre.pattern.syntax.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.preg-match-all.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Pattern Syntax</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.pcre.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >preg_match_all</TD ></TR ></TABLE ></DIV ></BODY ></HTML >