{"id":31503,"date":"2023-01-22T03:30:45","date_gmt":"2023-01-21T22:00:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-regular-expression-match-against-a-string-bluebar-and-darkbluefoo-to-darkblue\/"},"modified":"2023-01-22T03:30:45","modified_gmt":"2023-01-21T22:00:45","slug":"solved-regular-expression-match-against-a-string-bluebar-and-darkbluefoo-to-darkblue","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-regular-expression-match-against-a-string-bluebar-and-darkbluefoo-to-darkblue\/","title":{"rendered":"[Solved] Regular expression match against a string (blue:bar AND darkblue:foo) to darkblue"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-47067717\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"47067717\" data-parentid=\"47021036\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>These are some patterns that I have written that work (in order of least efficient to most efficient in terms of &#8220;step count&#8221;):<\/p>\n<p>Step counts are based on this sample input:<\/p>\n<pre><code>(green:bar AND black:foo)\n(blue:bar AND darkblue:foo)\n(yellow:bar AND grey:foo)\n(greengarden:bar AND red:foo)\n<\/code><\/pre>\n<ul>\n<li>\n<p><code>\/(?:red|blue|green)(*SKIP)(*FAIL)|[a-z]+(?=:)\/<\/code>  <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/1\">Demo<\/a> (513 steps)<\/p>\n<\/li>\n<li>\n<p><code>\/\\b(?!red:|blue:|green:)[a-z]+(?=:)\/<\/code> <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/2\">Demo<\/a> (372 steps)<\/p>\n<\/li>\n<li>\n<p><code>\/(?&lt;=\\(|AND )(?!red:|blue:|green:)[^:]*\/<\/code> <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/3\">Demo<\/a> (319 steps)<\/p>\n<\/li>\n<li>\n<p><code>\/(?&lt;=\\(|AND )(?:(?:red:|blue:|green:)(*SKIP)(*FAIL)|[^:]+)\/<\/code> <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/4\">Demo<\/a> (304 steps)<\/p>\n<\/li>\n<li>\n<p><code>\/(?:\\(|AND )\\K(?!red:|blue:|green:)[^:]*\/<\/code> <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/5\">Demo<\/a> (291 steps)<\/p>\n<\/li>\n<li>\n<p><code>\/(?:\\(|AND )\\K(?!red\\b|blue\\b|green\\b)[^:]+\/<\/code> <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/6\">Demo<\/a> (291 steps)<\/p>\n<\/li>\n<li>\n<p><code>\/[( ]\\K(?!red\\b|blue\\b|green\\b)[a-z]+\/<\/code> <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/xuMsR7\/7\">Demo<\/a> (172 steps)<\/p>\n<\/li>\n<\/ul>\n<p>This final pattern is the best performer and takes full advantage of the strict format of your input data &#8212; pertaining to capitalization, opening parentheses, and the two spaces per line.<\/p>\n<p>It finds the opening parenthesis or a space, then restarts the fullstring match using <code>\\K<\/code>, disqualifies any substring that is wholly <code>red<\/code>, <code>blue<\/code>, or <code>green<\/code> and stops matching on the last lowercase letter.<\/p>\n<p>In regex, speed gains are accomplished by using narrow character classes (<code>[]<\/code> &amp; <code>[^]<\/code>), limiting alternatives (pipes <code>|<\/code>), &#8220;lookarounds&#8221;, and capture\/non-capture groups.<\/p>\n<p>My patterns deliberately avoid making capture groups because they only lead to output array bloat.  All of your desired &#8220;color&#8221; substrings will be found in the fullstring [0] matches subarray that <code>preg_match_all()<\/code> returns.<\/p>\n<p>Code: (<a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/sandbox.onlinephpfunctions.com\/code\/70bac9a4df1b7ddede01e5e0d34c2f7e9432af4f\">Demo<\/a>)<\/p>\n<pre><code>$string='(green:bar AND black:foo)\n    (blue:bar AND darkblue:foo)\n    (yellow:bar AND grey:foo)\n    (greengarden:bar AND red:foo)';\n\nvar_export(preg_match_all('\/[( ]\\K(?!red\\b|blue\\b|green\\b)[a-z]+\/',$string,$out)?$out[0]:'fail');\n<\/code><\/pre>\n<p>Output:<\/p>\n<pre><code>array (\n  0 =&gt; 'black',\n  1 =&gt; 'darkblue',\n  2 =&gt; 'yellow',\n  3 =&gt; 'grey',\n  4 =&gt; 'greengarden',\n)\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Regular expression match against a string (blue:bar AND darkblue:foo) to darkblue <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] These are some patterns that I have written that work (in order of least efficient to most efficient in terms of &#8220;step count&#8221;): Step counts are based on this sample input: (green:bar AND black:foo) (blue:bar AND darkblue:foo) (yellow:bar AND grey:foo) (greengarden:bar AND red:foo) \/(?:red|blue|green)(*SKIP)(*FAIL)|[a-z]+(?=:)\/ Demo (513 steps) \/\\b(?!red:|blue:|green:)[a-z]+(?=:)\/ Demo (372 steps) \/(?&lt;=\\(|AND )(?!red:|blue:|green:)[^:]*\/ Demo &#8230; <a title=\"[Solved] Regular expression match against a string (blue:bar AND darkblue:foo) to darkblue\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-regular-expression-match-against-a-string-bluebar-and-darkbluefoo-to-darkblue\/\" aria-label=\"More on [Solved] Regular expression match against a string (blue:bar AND darkblue:foo) to darkblue\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[339,347],"class_list":["post-31503","post","type-post","status-publish","format-standard","hentry","category-solved","tag-php","tag-regex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Regular expression match against a string (blue:bar AND darkblue:foo) to darkblue - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-regular-expression-match-against-a-string-bluebar-and-darkbluefoo-to-darkblue\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Regular expression match against a string (blue:bar AND darkblue:foo) to darkblue - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] These are some patterns that I have written that work (in order of least efficient to most efficient in terms of &#8220;step count&#8221;): Step counts are based on this sample input: (green:bar AND black:foo) (blue:bar AND darkblue:foo) (yellow:bar AND grey:foo) (greengarden:bar AND red:foo) \/(?:red|blue|green)(*SKIP)(*FAIL)|[a-z]+(?=:)\/ Demo (513 steps) \/b(?!red:|blue:|green:)[a-z]+(?=:)\/ Demo (372 steps) \/(?&lt;=(|AND )(?!red:|blue:|green:)[^:]*\/ Demo ... 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