{"id":7780,"date":"2022-09-10T08:55:55","date_gmt":"2022-09-10T03:25:55","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-write-regular-expression-makes-sure-that-there-is-no-digits-after\/"},"modified":"2022-09-10T08:55:55","modified_gmt":"2022-09-10T03:25:55","slug":"solved-how-to-write-regular-expression-makes-sure-that-there-is-no-digits-after","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-write-regular-expression-makes-sure-that-there-is-no-digits-after\/","title":{"rendered":"[Solved] how to write regular expression makes sure that there is no digits after"},"content":{"rendered":"<p> [ad_1]<br \/>\n[*]<\/p>\n<div id=\"answer-29493042\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"29493042\" data-parentid=\"29493018\" data-score=\"4\" 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>Use a <em>negative lookahead assertion<\/em>:<\/p>\n<pre><code>r'\\b[a-z][*]{2}1(?!\\d)'\n<\/code><\/pre>\n<p>The <code>(?!...)<\/code> part is the lookahead; it states that it cannot match at any location where a digit (<code>\\d<\/code>) follows.<\/p>\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/regex101.com\/r\/vG3hL4\/1\">Regex101 demo<\/a>; note how only the second line is matched (blue).<\/p>\n<p>Python demo:<\/p>\n<pre><code>&gt;&gt;&gt; import re\n&gt;&gt;&gt; pattern = re.compile(r'\\b[a-z][*]{2}1(?!\\d)')\n&gt;&gt;&gt; pattern.search('x**1')\n&lt;_sre.SRE_Match object at 0x10869f1d0&gt;\n&gt;&gt;&gt; pattern.search('x**10') is None\nTrue\n&gt;&gt;&gt; pattern.search('x**10') is None\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 how to write regular expression makes sure that there is no digits after <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] [*] Use a negative lookahead assertion: r&#8217;\\b[a-z][*]{2}1(?!\\d)&#8217; The (?!&#8230;) part is the lookahead; it states that it cannot match at any location where a digit (\\d) follows. Regex101 demo; note how only the second line is matched (blue). Python demo: &gt;&gt;&gt; import re &gt;&gt;&gt; pattern = re.compile(r&#8217;\\b[a-z][*]{2}1(?!\\d)&#8217;) &gt;&gt;&gt; pattern.search(&#8216;x**1&#8217;) &lt;_sre.SRE_Match object at 0x10869f1d0&gt; &gt;&gt;&gt; &#8230; <a title=\"[Solved] how to write regular expression makes sure that there is no digits after\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-write-regular-expression-makes-sure-that-there-is-no-digits-after\/\" aria-label=\"More on [Solved] how to write regular expression makes sure that there is no digits after\">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":[349,347],"class_list":["post-7780","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python","tag-regex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] how to write regular expression makes sure that there is no digits after - 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-how-to-write-regular-expression-makes-sure-that-there-is-no-digits-after\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] how to write regular expression makes sure that there is no digits after - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] [*] Use a negative lookahead assertion: r&#039;b[a-z][*]{2}1(?!d)&#039; The (?!...) part is the lookahead; it states that it cannot match at any location where a digit (d) follows. Regex101 demo; note how only the second line is matched (blue). Python demo: &gt;&gt;&gt; import re &gt;&gt;&gt; pattern = re.compile(r&#039;b[a-z][*]{2}1(?!d)&#039;) &gt;&gt;&gt; pattern.search(&#039;x**1&#039;) &lt;_sre.SRE_Match object at 0x10869f1d0&gt; &gt;&gt;&gt; ... 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