[PHP]
<title>Regular expressions and style matching</title>
$find = "Love";//defines the variable to find
$result =preg_match ("/$find/", "I Love you,xiaohei!"); /The first parameter is the one you want to find
Variable, the second argument is a lookup string
Find "You" with a space before and after, return false
@ $result 1=preg_match ("\byou\b/", "I Love you,xiaohei!");
if ($result) {
echo "Match success!
";
}else {
echo "Match failed!
";
}
if ($result 1) {
echo "\byou\b/". " Match success!
";
}else {
echo "\byou\b/". " Match failed!
";
}
?>
/* ^ metacharacters are referred to as the beginning of the line end bit. Matches the style found at the beginning of the string.
* Judging whether there are Wangchangxu in the winning list ("Li Xingle Wangchangxu Black"), in judging, Wangchangxu, whether Li Xingle is the first
* */
$string = "Li Xingle Wangchangxu small Black";
$name 1 = "Wangchangxu";
$name 2 = "Li Xingle";
if (Ereg ("Wangchangxu", $string)) {//To determine if there are Wangchangxu
echo "has Wangchangxu!"
";
}
if (Ereg ("^ Li Xingle", $string)) {//Determine if the beginning of the line is Li Xingle
Echo ' Li Xingle is the first one
';
}
if (Ereg ("^ Wangchangxu", $string)) {
echo "Wangchangxu for the first
";
}
if (Ereg ("Small Black $", $string)) {//Determine if the end of the line is a small black
echo "Little Black is the last one
";
}
?>
Mailbox format judgment
Meta-character + is used to match the preceding subexpression one or more times: {2} Indicates the number of matches to be fed two times. {2,4} repeated 2-4 times
$myemail = "lixingle123@qq.com";
if (Ereg ([0-9a-za-z]+) ([@]) ([0-9a-za-z]+) ([.]) ([0-9a-za-z]{2,4}) ", $myemail)) {
echo $myemail. " Format is correct
";
}else {
echo $myemail. " The format is not correct, please re-enter!
";
}
?>
Match character formatting
Determine if the date format is YYYY-MM-DD format
$mydate = "2012-11-26";
if (Ereg ([0-9]{4}) (-) ([0-9]{2}) (-) ([0-9]{2}), $mydate, $regs)) {
echo $regs [1]. " Year $regs[3] Month $regs[5] Day
";
}else {
echo "Time format Error!
";
}
?>
/*php supports Perl-style regular expressions,
* Style matching function:
* int Preg_match (string $pattern, String $subject [, array $matches [, int flages]]);
* int Preg_match_all (string $pattern, String $subject [, array $matches [, int flages]]);
* Preg_match () and Preg_match_all () usage are similar, but the latter is the first one that matches the entire string, not the license, and returns the number of styles found
*
* */
$string = "I am studing php,php. PHP ";
$result =preg_match_all ("/php/i", $string, $matches, preg_offset_capture);
if ($result ==true) {
echo "$result PHP was found.
";
Print_r ($matches);
echo "
";
}else {
echo "PHP is not found.
";
Print_r ($matches);
echo "
";
}
?>
http://www.bkjia.com/PHPjc/477892.html www.bkjia.com true http://www.bkjia.com/PHPjc/477892.html techarticle [PHP] HTML head title regular expression and style match/title/head body? PHP $find =love;//defines the variable to find $result =preg_match (/$find/,i Love you, xiaohei!); /The first parameter is to ...
