{"id":6086,"date":"2021-08-12T19:58:25","date_gmt":"2021-08-12T14:28:25","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=6086"},"modified":"2021-08-12T19:58:44","modified_gmt":"2021-08-12T14:28:44","slug":"variable-regex-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/variable-regex-golang\/","title":{"rendered":"Golang Regex: Use a variable inside a Regular Expression"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/variable-regex-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/variable-regex-golang\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">The <strong>regexp.MustCompile<\/strong>\u00a0function is used to compile the given regex string. So the input to the MustCompile function is a string only. And since it is a string we can concatenate any variable with the rest of the pattern.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">For example<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">regex := `b+`\nsampleRegexp := regexp.MustCompile(\"a\" + regex)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">So here we are doing concatenation to get the whole pattern<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">\"a\" + regex<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see a running program for the same.<\/p>\n\n\n\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"regexp\"\n)\n\nfunc main() {\n\tregex := `b+`\n\tsampleRegexp := regexp.MustCompile(\"a\" + regex)\n\n\tmatch := sampleRegexp.FindString(\"abb\")\n\tfmt.Println(match)\n\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">abb<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewProgram Overview The regexp.MustCompile\u00a0function is used to compile the given regex string. So the input to the MustCompile function is a string only. And since it is a string&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4],"class_list":["post-6086","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Golang Regex: Use a variable inside a Regular Expression - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/variable-regex-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Golang Regex: Use a variable inside a Regular Expression - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewProgram Overview The regexp.MustCompile\u00a0function is used to compile the given regex string. 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