{"id":11189,"date":"2023-10-15T03:26:11","date_gmt":"2023-10-15T10:26:11","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=11189"},"modified":"2023-10-15T03:30:35","modified_gmt":"2023-10-15T10:30:35","slug":"mysql-regexp_like","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-regular-expressions\/mysql-regexp_like\/","title":{"rendered":"MySQL REGEXP_LIKE() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>REGEXP_LIKE()<\/code> function to check if a string matches a regular expression.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL REGEXP_LIKE function<\/h2>\n\n\n\n<p>The <code>REGEXP_LIKE()<\/code> function returns 1 if a string matches a <a href=\"https:\/\/www.mysqltutorial.org\/mysql-regular-expressions\/\">regular expression<\/a> or 0 otherwise.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>REGEXP_LIKE()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">REGEX_LIKE(string, pattern, match_type)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>string<\/code>: This is the input string you want to check if it matches a pattern.<\/li>\n\n\n\n<li><code>pattern<\/code>: This is the regular expression that you want to match.<\/li>\n\n\n\n<li><code>match_type<\/code> is a string that includes one or more option that specifies how the function will perform matching. For example, <code>c<\/code> is case-sensitive matching whereas <code>i<\/code> is case-insensitive matching.<\/li>\n<\/ul>\n\n\n\n<p>If the <code>string<\/code> or <code>pattern<\/code> is <code>NULL<\/code>, the <code>REGEXP_LIKE()<\/code> function returns <code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL REGEXP_LIKE() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>REGEXP_LIKE()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Simple REGEXP_LIKE() function examples<\/h3>\n\n\n\n<p>The following example uses the <code>REGEXP_LIKE()<\/code> function to check if the string <code>MySQL 8.0<\/code> matches with the regular expression<code> \"\\\\d+\\\\.\\\\d+\"<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">SELECT REGEXP_LIKE(<span class=\"hljs-string\">\"MySQL 8.0\"<\/span>,<span class=\"hljs-string\">\"\\\\d+\\\\.\\\\d+\"<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+----------------------------------------+\n| REGEXP_LIKE(<span class=\"hljs-string\">\"MySQL 8.0\"<\/span>,<span class=\"hljs-string\">\"\\\\d+\\\\.\\\\d+\"<\/span>) |\n+----------------------------------------+\n|                                      <span class=\"hljs-number\">1<\/span> |\n+----------------------------------------+\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.01 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, the pattern <code>\"\\\\d+\\\\.\\\\d+\"<\/code> matches one or more digits, followed by a character (.), and followed by one or more digits. <\/p>\n\n\n\n<p>Since the input string has the substring <code>8.0<\/code> that matches the pattern, the <code>REGEXP_LIKE()<\/code> function returns 1.<\/p>\n\n\n\n<p>The following example uses the <code>REGEXP_LIKE()<\/code> function and returns <code>0<\/code> because the input string doesn&#8217;t match the regular expression:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">SELECT REGEXP_LIKE(<span class=\"hljs-string\">\"MySQL 8\"<\/span>,<span class=\"hljs-string\">\"\\\\d+\\\\.\\\\d+\"<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+--------------------------------------+\n| REGEXP_LIKE(<span class=\"hljs-string\">\"MySQL 8\"<\/span>,<span class=\"hljs-string\">\"\\\\d+\\\\.\\\\d+\"<\/span>) |\n+--------------------------------------+\n|                                    <span class=\"hljs-number\">0<\/span> |\n+--------------------------------------+\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2) Using REGEXP_LIKE() function with the table data example<\/h3>\n\n\n\n<p>We&#8217;ll use the <code>products <\/code>table from the <a href=\"https:\/\/www.mysqltutorial.org\/getting-started-with-mysql\/mysql-sample-database\/\">sample database<\/a>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2023\/10\/products.svg\" alt=\"\" class=\"wp-image-10788\"\/><\/figure>\n\n\n\n<p>The following example uses the <code>REGEXP_LIKE()<\/code> function to get the product names that start with 4 digits <code>\"^\\\\d{4}\"<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">SELECT \n  productName \nFROM \n  products \nWHERE \n  REGEXP_LIKE(productName, <span class=\"hljs-string\">\"^\\\\d{4}\"<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+---------------------------------------------+\n| productName                                 |\n+---------------------------------------------+\n| <span class=\"hljs-number\">1969<\/span> Harley Davidson Ultimate Chopper       |\n| <span class=\"hljs-number\">1952<\/span> Alpine Renault <span class=\"hljs-number\">1300<\/span>                    |\n| <span class=\"hljs-number\">1996<\/span> Moto Guzzi <span class=\"hljs-number\">1100<\/span>i                       |\n| <span class=\"hljs-number\">2003<\/span> Harley-Davidson Eagle Drag Bike        |\n| <span class=\"hljs-number\">1972<\/span> Alfa Romeo GTA                         |\n...<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, we use the <code>REGEXP_LIKE()<\/code> function in the <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-where\/\">WHERE<\/a><\/code> clause. If the product name matches the regular expression, it returns 1, the query includes the product in the result set.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3) Using REGEXP_LIKE function to validate data example<\/h3>\n\n\n\n<p>Suppose you have a table called <code>contacts<\/code> with three columns: <code>id<\/code>, <code>name<\/code>, and <code>email<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">CREATE TABLE contacts(\n  id INT AUTO_INCREMENT, \n  name VARCHAR(<span class=\"hljs-number\">255<\/span>) NOT NULL, \n  email VARCHAR(<span class=\"hljs-number\">300<\/span>) NOT NULL, \n  PRIMARY KEY(id)\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Before inserting or updating a value into the <code>email<\/code> column, you may want to check if the email format is valid.<\/p>\n\n\n\n<p>To do that you can use the <code>REGEXP_LIKE<\/code> with a <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-check-constraint\/\"><code>CHECK<\/code> constraint<\/a>. The <code>CHECK<\/code> constraint will execute the <code>REGEXP_LIKE()<\/code> function whenever you <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-insert\/\">insert<\/a> a value into the email column or <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-update\/\">update<\/a> a value from the email column.<\/p>\n\n\n\n<p>The following statement adds a <code>CHECK<\/code> constraint to the <code>email<\/code> column of the <code>contacts<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">ALTER TABLE \n  contacts \nADD \n  CONSTRAINT email_validation CHECK (\n     REGEXP_LIKE(email, <span class=\"hljs-string\">\"^\\\\S+@\\\\S+\\\\.\\\\S+$\"<\/span>) = <span class=\"hljs-number\">1<\/span>\n  );<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Notice that for brevity, we use a simple regular expression to validate email in most cases. For a comprehensive one, you can use the regex following regex that matches email addresses based on the <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc2822\">RFC2822 standard:<\/a><\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">\/&#91;a-z0<span class=\"hljs-number\">-9<\/span>!#$%&amp;<span class=\"hljs-string\">'*+\/=?^_`{|}~-]+(?:\\.&#91;a-z0-9!#$%&amp;'<\/span>*+<span class=\"hljs-regexp\">\/=?^_`{|}~-]+)*@(?:&#91;a-z0-9](?:&#91;a-z0-9-]*&#91;a-z0-9])?\\.)+&#91;a-z0-9](?:&#91;a-z0-9-]*&#91;a-z0-9])?\/g<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following statement inserts a new row with a valid email format into the <code>contacts<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">INSERT INTO contacts(name, email) \nVALUES(<span class=\"hljs-string\">\"John Doe\"<\/span>, <span class=\"hljs-string\">\"john.doe@mysqltutorial.org\"<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>It works as expected.<\/p>\n\n\n\n<p>However, if you insert a new contact with an invalid email address, the <code>CHECK<\/code> constraint will be violated, which will result in the rejection of the insertion:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">INSERT INTO contacts(name, email) \nVALUES(<span class=\"hljs-string\">\"Jane Doe\"<\/span>, <span class=\"hljs-string\">\"jane.doe@mysqltutorial\"<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">ERROR <span class=\"hljs-number\">3819<\/span> (HY000): Check constraint <span class=\"hljs-string\">'email_validation'<\/span> is violated.<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Similarly, if you update an existing email to an invalid format, the change will not be applied:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">UPDATE \n  contacts \nSET \n  email = <span class=\"hljs-string\">'invalid email'<\/span> \nWHERE \n  id = <span class=\"hljs-number\">1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>REGEXP_LIKE()<\/code> function to check if an input string matches with a regular expression.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful? 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Introduction to MySQL REGEXP_LIKE function The REGEXP_LIKE() function returns 1 if a string matches a regular expression or 0 otherwise. Here&#8217;s the syntax of the REGEXP_LIKE() function: In this syntax: If the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":11140,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-11189","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MySQL REGEXP_LIKE() Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to use the MySQL REGEXP_LIKE() function to check if a string matches a regular expression.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mysqltutorial.org\/mysql-regular-expressions\/mysql-regexp_like\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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