PHP Regular Expression functions

　　

PHP Regular Expressions

<?php
//Common Regular Expression function summary (all start with preg_, except Preg_quote, the first parameter is regular expression)
///1.preg_match ($pattern, $subject, $arr)//Match Single Form validation
//2.preg_match_all ($pattern, $subject, $arr)//Match multiple forms validation
///3.preg_filter ($pattern, $replacement, $subject) preserves only the string that has been replaced
4.preg_replace ($pattern, $replacement, $subject) all strings are displayed illegal word filtering
///5.preg_grep ($pattern, $subject) match only, do not replace
///6.preg_split ($pattern, $subject) Split string action is similar to explode function
///7.preg_quote ($STR); regular arithmetic escape function
Header(' content-type:text/html;charset= ' Utf-8 "');
functionShow ($arr= NULL)
{
if($arr== NULL)
   {
Echo' null ';
   }
ElseIf(Is_array($arr))
   {
Echo' <pre> ';
Print_r($arr);
Echo' </pre> ';
   }Else
{
Echo$arr;
   }
}

/**
* PHP Regular expression function
* Preg_match ($parteen, $str, $arr); match a single
* Preg_match_all ($parteen, $str, $arr); match all
* Returns the number of matches to
 */
$parteen= '/[0-3]/';
$str= ' Weeffdsfsdfd3454fdxvdfg6vxv8 ';
$replacement= ' Test ';
/* $m 1 = $m 2 = array ();
$t 1 = preg_match ($parteen, $str, $m 1);
$t 2 = Preg_match_all ($parteen, $str, $m 2);
Show ($m 1);
echo ' 
Show ($m 2);
echo ' 
Echo Show ($t 1. ' | | '. $t 2); * *

/**
* Preg_replace and Preg_filter
* Preg_repace ($pattern, $replacement, $subject) will display all the strings
* Preg_filter ($pattern, $replacement, $subject) preserves only the strings that have been replaced
 */
/* $parteen = Array ('/[0123]/', '/[456]/', ' [789] ');
$str = Array (' Wewe ', ' w234 ', ' f454 ');
$replacement = Array (' High ', ' short ', ' fat ');
$t 1 = preg_replace ($parteen, $replacement, $STR);
$t 2 = Preg_filter ($parteen, $replacement, $STR);
Show ($t 1);
echo ' 
Show ($t 2);
echo ' 

/**
* PREG_GREP ($pattern, $subject) only do matches, do not replace
*/
/ * $parteen = '/[0-9]/';
$str = Array (' Wewe ', ' w234 ', ' f454 ');
$t 1 = preg_grep ($parteen, $STR);
Show ($t 1); * *

/**
* Preg_split ($pattern, $subject) Split string action is similar to explode function
*/
/ * $parteen = '/[0-9]/';
$subject = ' This 4 is 11 things to test ';
$t 1 = preg_split ($parteen, $subject);
Show ($t 1); * *

/**
* Preg_quote ($STR); regular arithmetic turn
*/
$str= ' Qwer[123]{sadas} ';
$t 1= Preg_quote($str);
Show ($t 1);
?>

PHP Regular Expression functions