{"id":2044,"date":"2025-02-11T21:21:23","date_gmt":"2025-02-11T14:21:23","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=2044"},"modified":"2025-02-11T21:32:48","modified_gmt":"2025-02-11T14:32:48","slug":"postgresql-regexp_replace","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-regexp_replace\/","title":{"rendered":"PostgreSQL REGEXP_REPLACE Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>REGEXP_REPLACE<\/code> function to replace substrings in a string based on a regular expression.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='postgresql-regexp_replace-function-overview'>PostgreSQL REGEXP_REPLACE Function Overview <a href=\"#postgresql-regexp_replace-function-overview\" class=\"anchor\" id=\"postgresql-regexp_replace-function-overview\" title=\"Anchor for PostgreSQL REGEXP_REPLACE Function Overview\">#<\/a><\/h2>\n\n\n\n<p>The <code>REGEXP_REPLACE<\/code> function replaces substrings in a string based on a <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-regular-expressions\/#introduction-to-posix-regular-expressions\">POSIX regular expression<\/a> pattern.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>REGEXP_REPLACE<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">REGEXP_REPLACE(source_string, pattern, replacement &#91;, flags])<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>REGEXP_REPLACE<\/code> function takes four parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>string<\/code>: The input string you want to replace a pattern.<\/li>\n\n\n\n<li><code>pattern<\/code>: A POSIX regular expression to match.<\/li>\n\n\n\n<li><code>replacement<\/code>: The string used to replace matches.<\/li>\n\n\n\n<li><code>flags<\/code> (optional): is a modifier that controls the function that performs a regular expression match. For example, <code>'i'<\/code> for case-insensitive matching and <code>'g'<\/code> for global replacement.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='postgresql-regexp_replace-function-examples'>PostgreSQL REGEXP_REPLACE function examples <a href=\"#postgresql-regexp_replace-function-examples\" class=\"anchor\" id=\"postgresql-regexp_replace-function-examples\" title=\"Anchor for PostgreSQL REGEXP_REPLACE function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>REGEXP_REPLACE<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='removing-all-non-numeric-characters'>Removing All Non-Numeric Characters <a href=\"#removing-all-non-numeric-characters\" class=\"anchor\" id=\"removing-all-non-numeric-characters\" title=\"Anchor for Removing All Non-Numeric Characters\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>REGEXP_REPLACE<\/code> function to extract only numbers from a string with mixed numbers and strings:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> REGEXP_REPLACE(<span class=\"hljs-string\">'Order: 123-ABC-456'<\/span>, <span class=\"hljs-string\">'&#91;^0-9]'<\/span>, <span class=\"hljs-string\">''<\/span>, <span class=\"hljs-string\">'g'<\/span>) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIFJFR0VYUF9SRVBMQUNFKCdPcmRlcjogMTIzLUFCQy00NTYnLCAnW14wLTldJywgJycsICdnJykgcmVzdWx0Ow%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\"> result\n--------\n 123456<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='standardizing-phone-numbers'>Standardizing Phone Numbers <a href=\"#standardizing-phone-numbers\" class=\"anchor\" id=\"standardizing-phone-numbers\" title=\"Anchor for Standardizing Phone Numbers\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>REGEXP_REPLACE<\/code> function to format the phone number in the following format <code>(123) 456-7890<\/code> :<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  REGEXP_REPLACE(\n    <span class=\"hljs-string\">'1234567890'<\/span>,\n    <span class=\"hljs-string\">'(\\d{3})(\\d{3})(\\d{4})'<\/span>,\n    <span class=\"hljs-string\">'(\\1) \\2-\\3'<\/span>\n  ) phone_number;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIFJFR0VYUF9SRVBMQUNFKCAnMTIzNDU2Nzg5MCcsICcoXGR7M30pKFxkezN9KShcZHs0fSknLCAnKFwxKSBcMi1cMycgKSBwaG9uZV9udW1iZXI7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">  phone_number\n----------------\n (123) 456-7890<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='removing-redundant-whitespace'>Removing redundant whitespace <a href=\"#removing-redundant-whitespace\" class=\"anchor\" id=\"removing-redundant-whitespace\" title=\"Anchor for Removing redundant whitespace\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>REGEXP_REPLACE<\/code> function to normalize multiple spaces into a single space:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  REGEXP_REPLACE(\n    <span class=\"hljs-string\">'Hello    World!  This  is pgtutoiral.com.'<\/span>,\n    <span class=\"hljs-string\">'\\s+'<\/span>,\n    <span class=\"hljs-string\">' '<\/span>,\n    <span class=\"hljs-string\">'g'<\/span>\n  ) message;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIFJFR0VYUF9SRVBMQUNFKCAnSGVsbG8gV29ybGQhIFRoaXMgaXMgcGd0dXRvaXJhbC5jb20uJywgJ1xzKycsICcgJywgJ2cnICkgbWVzc2FnZTs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">               message\n--------------------------------------\n Hello World! This is pgtutoiral.com.<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='censoring-offensive-words'>Censoring Offensive Words <a href=\"#censoring-offensive-words\" class=\"anchor\" id=\"censoring-offensive-words\" title=\"Anchor for Censoring Offensive Words\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>REGEXP_REPLACE<\/code> function to replace variations of offensive words while preserving part of them:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  REGEXP_REPLACE(\n    <span class=\"hljs-string\">'This tutorial is damn good.'<\/span>,\n    <span class=\"hljs-string\">'damn'<\/span>,\n    <span class=\"hljs-string\">'d***'<\/span>,\n    <span class=\"hljs-string\">'gi'<\/span>\n  ) message;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIFJFR0VYUF9SRVBMQUNFKCAnVGhpcyB0dXRvcmlhbCBpcyBkYW1uIGdvb2QuJywgJ2RhbW4nLCAnZCoqKicsICdnaScgKSBtZXNzYWdlOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">           message\n-----------------------------\n This tutorial is d*** good.<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>REGEXP_REPLACE<\/code> function for regular expression pattern-based replacements.<\/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 ?<\/div>\n\t\t<div 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