{"id":12133,"date":"2022-09-29T19:09:16","date_gmt":"2022-09-29T13:39:16","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-need-to-find-a-pattern-and-extract-that-out-closed\/"},"modified":"2022-09-29T19:09:16","modified_gmt":"2022-09-29T13:39:16","slug":"solved-need-to-find-a-pattern-and-extract-that-out-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-need-to-find-a-pattern-and-extract-that-out-closed\/","title":{"rendered":"[Solved] need to find a pattern and extract that out [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-54694490\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"54694490\" data-parentid=\"54694094\" 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>I&#8217;ll take one stab at this with two implementations.<\/p>\n<p>First, I&#8217;ll use a <code>character<\/code> vector. If yours is in a frame, replace it with <code>myframe$mycolumn<\/code>.<\/p>\n<pre class=\"lang-r prettyprint-override\"><code>v &lt;- c(\"110231 validation 108871 validation 85933\",\n\"21102 validation 93442 21232 validation 73769 26402 validation 127221 26402\",\n\"99763 99763 validation 99763 validation 99763\",\n\"validation 199022 validation 122099 validation 12209 validation 199022 validation 199022 validation 122099\")\n<\/code><\/pre>\n<p><strong>Extraction of &#8220;validation number&#8221; matches<\/strong><\/p>\n<pre class=\"lang-r prettyprint-override\"><code>re &lt;- gregexpr(\"validation [0-9]+\", v)\nre\n# [[1]]\n# [1]  8 26\n# attr(,\"match.length\")\n# [1] 17 16\n# attr(,\"index.type\")\n# [1] \"chars\"\n# attr(,\"useBytes\")\n# [1] TRUE\n# [[2]] ...\n<\/code><\/pre>\n<p>We can extract the matching substrings with <code>regmatches<\/code>:<\/p>\n<pre class=\"lang-r prettyprint-override\"><code>regmatches(v, re)\n# [[1]]\n# [1] \"validation 108871\" \"validation 85933\" \n# [[2]]\n# [1] \"validation 93442\"  \"validation 73769\"  \"validation 127221\"\n# [[3]]\n# [1] \"validation 99763\" \"validation 99763\"\n# [[4]]\n# [1] \"validation 199022\" \"validation 122099\" \"validation 12209\" \n# [4] \"validation 199022\" \"validation 199022\" \"validation 122099\"\n<\/code><\/pre>\n<p>Now we have a list where each of your strings produced 1 or more matching substrings. Now we can just iterate over the list and get just the first element.<\/p>\n<pre class=\"lang-r prettyprint-override\"><code>sapply(regmatches(v, re), `[`, 1)\n# [1] \"validation 108871\" \"validation 93442\"  \"validation 99763\" \n# [4] \"validation 199022\"\n<\/code><\/pre>\n<p>This should not fail, even if a string does not contain the substring pattern:<\/p>\n<pre class=\"lang-r prettyprint-override\"><code>v &lt;- c(v, \"nothing here\")\nre &lt;- gregexpr(\"validation [0-9]+\", v)\nsapply(regmatches(v, re), `[`, 1)\n# [1] \"validation 108871\" \"validation 93442\"  \"validation 99763\" \n# [4] \"validation 199022\" NA                 \n<\/code><\/pre>\n<p>where the <code>NA<\/code> indicates no matches but still preserves a place in your string vector.<\/p>\n<p><strong><code>gsub<\/code> only<\/strong><\/p>\n<p>First, remove numbers\/spaces up to but not including the first &#8220;validation&#8221;:<\/p>\n<pre class=\"lang-r prettyprint-override\"><code>gsub(\"^[0-9 ]*(?=validation)\", \"\", v, perl=TRUE)\n# [1] \"validation 108871 validation 85933\"                                                                        \n# [2] \"validation 93442 21232 validation 73769 26402 validation 127221 26402\"                                     \n# [3] \"validation 99763 validation 99763\"                                                                         \n# [4] \"validation 199022 validation 122099 validation 12209 validation 199022 validation 199022 validation 122099\"\n<\/code><\/pre>\n<p>Now remove anything after the first &#8220;number&#8221;:<\/p>\n<pre class=\"lang-r prettyprint-override\"><code>gsub(\"([0-9])\\\\b.*\", \"\", gsub(\"^[0-9 ]*(?=validation)\", \"\", v, perl=TRUE))\n# [1] \"validation 10887\" \"validation 9344\"  \"validation 9976\"  \"validation 19902\"\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 need to find a pattern and extract that out [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I&#8217;ll take one stab at this with two implementations. First, I&#8217;ll use a character vector. If yours is in a frame, replace it with myframe$mycolumn. v &lt;- c(&#8220;110231 validation 108871 validation 85933&#8221;, &#8220;21102 validation 93442 21232 validation 73769 26402 validation 127221 26402&#8221;, &#8220;99763 99763 validation 99763 validation 99763&#8221;, &#8220;validation 199022 validation 122099 validation 12209 &#8230; <a title=\"[Solved] need to find a pattern and extract that out [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-need-to-find-a-pattern-and-extract-that-out-closed\/\" aria-label=\"More on [Solved] need to find a pattern and extract that out [closed]\">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":[321,347],"class_list":["post-12133","post","type-post","status-publish","format-standard","hentry","category-solved","tag-r","tag-regex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] need to find a pattern and extract that out [closed] - 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-need-to-find-a-pattern-and-extract-that-out-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] need to find a pattern and extract that out [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I&#8217;ll take one stab at this with two implementations. 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