Mysql NOT REGXP operator ~ Tech Blog

Tuesday, 10 July 2018

Mysql NOT REGXP operator

MySQL NOT REGXP is used to perform a pattern match of a string expression expr against a pattern pat. The pattern can be an extended regular expression.

Syntax:

expr NOT REGEXP pat

Argument

Name	Description
expr	string expression
pat	A pattern which is not to be matched.

The function returns 1 if expr matches pat; otherwise, it returns 0. If either expr or pat is NULL, the result is NULL

MySQL Version: 5.6

Example -1: MySQL NOT REGXP operator

The above MySQL statement will find the name of the country not beginning with ‘U’. The ‘^’ have been used to match the beginning of the name.

Code:

SELECT * FROM author 
WHERE country NOT REGEXP '^U';



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Sample table: author

Sample Output:

mysql> SELECT * FROM author 
    -> WHERE country NOT REGEXP '^U';
+--------+----------------------+-----------+----------------+
| aut_id | aut_name             | country   | home_city      |
+--------+----------------------+-----------+----------------+
| AUT002 | William Maugham      | Canada    | Toronto        | 
| AUT004 | S.B.Swaminathan      | India     | Bangalore      | 
| AUT005 | Thomas Morgan        | Germany   | Arnsberg       | 
| AUT009 | Marquis de Ellis     | Brazil    | Rio De Janerio | 
| AUT011 | John Betjeman Hunter | Australia | Sydney         | 
| AUT012 | Evan Hayek           | Canada    | Vancouver      | 
| AUT013 | E. Howard            | Australia | Adelaide       | 
+--------+----------------------+-----------+----------------+
7 rows in set (0.17 sec)

PHP script

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example-not-regexp-function - php mysql examples | w3resource</title>
<meta name="description" content="example-not-regexp-function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>A list of Authors with their id, name country and home city. The list set against a condition, and that is, Author's name should not begin with 'U':</h2>
<table class='table table-bordered'>
<tr>
<th>Author's id</th><th>Author's name</th><th>Country</th><th>home_city</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT *
FROM author
WHERE country NOT REGEXP "^U"') as $row) {
echo "<tr>";
echo "<td>" . $row['aut_id'] . "</td>";
echo "<td>" . $row['aut_name'] . "</td>";
echo "<td>" . $row['country'] . "</td>";
echo "<td>" . $row['home_city'] . "</td>";
echo "</tr>";  
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>



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Example -2: MySQL NOT REGXP operator

The following MySQL statement will find the author’s name not ending with ‘on’ and not ending with ‘an’. The ‘$’ character have been used to match the ending of the name.

SELECT * FROM author 
WHERE aut_name NOT REGEXP "on$" 
AND aut_name NOT REGEXP "an$";



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Sample table: author

Sample Output:

 mysql> SELECT * FROM author 
    -> WHERE aut_name NOT REGEXP "on$" 
    -> AND aut_name NOT REGEXP "an$";
+--------+----------------------+-----------+----------------+
| aut_id | aut_name             | country   | home_city      |
+--------+----------------------+-----------+----------------+
| AUT002 | William Maugham      | Canada    | Toronto        | 
| AUT003 | William Anthony      | UK        | Leeds          | 
| AUT008 | Nikolai Dewey        | USA       | Atlanta        | 
| AUT009 | Marquis de Ellis     | Brazil    | Rio De Janerio | 
| AUT011 | John Betjeman Hunter | Australia | Sydney         | 
| AUT012 | Evan Hayek           | Canada    | Vancouver      | 
| AUT013 | E. Howard            | Australia | Adelaide       | 
| AUT014 | C. J. Wilde          | UK        | London         | 
| AUT015 | Butler Andre         | USA       | Florida        | 
+--------+----------------------+-----------+----------------+
9 rows in set (0.01 sec)

PHP script

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example1-not-regexp-function - php mysql examples | w3resource</title>
<meta name="description" content="example1-not-regexp-function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>A list of Authors with their id, name country and home city. The list set against a condition, and that is, Author's name should not end with 'on' and also not with 'an':</h2>
<table class='table table-bordered'>
<tr>
<th>Author's id</th><th>Author's name</th><th>Country</th><th>Home city</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT *
FROM author 
WHERE aut_name NOT REGEXP "on$"
AND aut_name NOT REGEXP "an$"') as $row) {
echo "<tr>";
echo "<td>" . $row['aut_id'] . "</td>";
echo "<td>" . $row['aut_name'] . "</td>";
echo "<td>" . $row['country'] . "</td>";
echo "<td>" . $row['home_city'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>

Tech Blog

Tuesday, 10 July 2018